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A collection of scholarly literature created by experts and professionals in their fields. Included are theses, books, abstracts and articles.



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We propose a method for using ultracold atomic Bose-Einstein condensates, to form an analog model of a relativistic massive field that carries "charge" and interacts with an external nondynamical gauge field. Such a "scalar QED" analog model, may be useful for simulating various effects of QFT involving charged particles, such as the Schwinger pair-creation of charged phonons in a constant external field, and vacuum instability.
Topics: High Energy Physics - Theory, Quantum Physics, Condensed Matter, Quantum Gases
Source: http://arxiv.org/abs/1611.04797
Arxiv.org
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We consider a nonstationary array of conductors, connected by resistances that fluctuate with time. The charge transfer between a particular pair of conductors is supposed to be dominated by "electrical breakdowns" -- the moments when the corresponding resistance is close to zero. An amount of charge, transferred during a particular breakdown, is controlled by the condition of minimum for the electrostatic energy of the system. We find the conductivity, relaxation rate, and...
Topics: Disordered Systems and Neural Networks, Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1509.08596
Arxiv.org
by Mykyta V. Chubynsky; Gary W. Slater
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Wang et al. [PNAS 106 (2009) 15160] have found that in several systems the linear time dependence of the mean-square displacement (MSD) of diffusing colloidal particles, typical of normal diffusion, is accompanied by a non-Gaussian displacement distribution (DisD), with roughly exponential tails at short times, a situation they termed "anomalous yet Brownian" diffusion. The diversity of systems in which this is observed calls for a generic model. We present such a model where there is...
Topics: Soft Condensed Matter, Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1404.3573
Arxiv.org
by David M. Fobes; Igor A. Zaliznyak; John M. Tranquada; Zhijun Xu; Genda Gu; Xu-Gang He; Wei Ku; Yang Zhao; Masaaki Matsuda; V. Ovidu Garlea; Barry Winn
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Investigation of the inelastic neutron scattering spectra in Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ near a signature wave vector $\mathbf{Q} = (1,0,0)$ for the bond-order wave (BOW) formation of parent compound Fe$_{1+y}$Te [Phys. Rev. Lett. 112, 187202 (2014)] reveals an acoustic-phonon-like dispersion present in all structural phases. While a structural Bragg peak accompanies the mode in the low-temperature phase of Fe$_{1+y}$Te, it is absent in the high-temperature tetragonal phase, where Bragg...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1509.05930
Arxiv.org
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Gibbsian statistical mechanics is extended into the domain of non-negligible {though non-specified} correlations in phase space while respecting the fundamental laws of thermodynamics. The appropriate Gibbsian probability distribution is derived and the physical temperature identified. Consistent expressions for the canonical partition function are given. In a first application, the corresponding Boltzmann, Fermi and Bose-Einstein distributions are obtained. It is shown that the latter lose...
Topics: Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1406.6639
Arxiv.org
by O. G. Udalov; A. A. Fraerman
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We study a neutron diffraction by A phase of MnSi using a dynamical theory of diffraction and three wave approximation. We show that the neutron diffraction is asymmetrical with respect to an incident plane. The asymmetry depends on a sign of an external magnetic field. This phenomenon can be considered as the Hall effect for neutrons.
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1405.0626
Arxiv.org
by Yongkang Luo; N. J. Ghimire; E. D. Bauer; J. D. Thompson; F. Ronning
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We report the effect of hydrostatic pressure on the magnetotransport properties of the Weyl semimetal NbAs. Subtle changes can be seen in the $\rho_{xx}(T)$ profiles with pressure up to 2.31 GPa. The Fermi surfaces undergo an anisotropic evolution under pressure: the extremal areas slightly increase in the $\mathbf{k_x}$-$\mathbf{k_y}$ plane, but decrease in the $\mathbf{k_z}$-$\mathbf{k_y}$($\mathbf{k_x}$) plane. The topological features of the two pockets observed at atmospheric pressure,...
Topics: Superconductivity, Materials Science, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1510.08538
Arxiv.org
by Nash Rochman; Sean X. Sun
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In a previous paper, we examined a class of possible conformations for helically patterned filaments in contact with a bonding surface. In particular, we investigated geometries where contact between the pattern and the surface was improved through a periodic twisting and lifting of the filament. A consequence of this lifting is that the total length of the filament projected onto the surface decreases after bonding. When the bonding character of the surface is actuated, this phenomenon can...
Topics: Soft Condensed Matter, Condensed Matter, Physics, Subcellular Processes, Biological Physics,...
Source: http://arxiv.org/abs/1612.03134
Arxiv.org
by L. F. Rybal'chenko; I. K. Yanson; V. V. Fisun; N. L. Bobrov; Yu. D. Tret'yakov; A. R. Kaul'; I. E. Graboi
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Electrical characteristics are measured in submicron YBaCuO-normal metal point contacts with a direct conductivity. In a microwave field, such contacts reveal a nonstationary Josephson effect which can occur in the current concentration region not only in the initial weak bonds in YBaCuO but also the weak bonds of a phase-slip center type, formed as a result of a significant current injection (as well as a microwave field). The existence of internal weak bonds in the HTS-electrode contact area...
Topics: Condensed Matter, Superconductivity
Source: http://arxiv.org/abs/1702.01305
Arxiv.org
by Lars Bonnes; Fabian H. L. Essler; Andreas M. Läuchli
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Signal propagation in the non equilibirum evolution after quantum quenches has recently attracted much experimental and theoretical interest. A key question arising in this context is what principles, and which of the properties of the quench, determine the characteristic propagation velocity. Here we investigate such issues for a class of quench protocols in one of the central paradigms of interacting many-particle quantum systems, the spin-1/2 Heisenberg XXZ chain. We consider quenches from a...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1404.4062
Arxiv.org
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Recently it was revealed that the whole Fermi surface is fully gapped for several families of underdoped cuprates. The existence of the finite energy gap along the $d$-wave nodal lines ("nodal gap") contrasts the common understanding of the $d$-wave pairing symmetry, which challenges the present theories for the high-$T_c$ superconductors. Here we propose that the incommensurate diagonal spin-density-wave order can account for the above experimental observation. The Fermi surface and...
Topics: Superconductivity, Condensed Matter
Source: http://arxiv.org/abs/1406.5408
Arxiv.org
by Basile Pottier; Ludovic Bellon
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When measuring quadratic values representative of random fluctuations, such as the thermal noise of Atomic Force Microscopy (AFM) cantilevers, the background measurement noise cannot be averaged to zero. We present a signal processing method that allows to get rid of this limitation using the ubiquitous optical beam deflection sensor of standard AFMs. We demonstrate a two orders of magnitude enhancement of the signal to noise ratio in our experiment, allowing the calibration of stiff...
Topics: Physics, Statistical Mechanics, Condensed Matter, Instrumentation and Detectors
Source: http://arxiv.org/abs/1703.02811
Arxiv.org
by Uwe R. Fischer; Myung-Kyun Kang
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We consider ultracold quantum gases of scalar bosons, residing in a coupling strength--density regime in which they constitute a twofold fragmented condensate trapped in a single well. It is shown that the corresponding quantum states are, in the appropriate Fock space basis, identical to the photon cat states familiar in quantum optics, which correspond to superpositions of coherent states of the light field with a phase difference of $\pi$. In marked distinction to photon cat states, the very...
Topics: Quantum Physics, Quantum Gases, Condensed Matter
Source: http://arxiv.org/abs/1506.07478
Arxiv.org
by Andreas Elmerdahl Olsen; Jeppe C. Dyre; Thomas B. Schrøder
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Computer simulations show that liquids of molecules with harmonic intramolecular bonds may have "pseudoisomorphic" lines of approximately invariant dynamics in the thermodynamic phase diagram. We demonstrate that these lines can be identified by requiring scale invariance of the inherent-structure reduced-unit low-frequency vibrational spectrum evaluated for a single equilibrium configuration. This rationalizes why excess-entropy scaling, density scaling, and isochronal superposition...
Topics: Soft Condensed Matter, Statistical Mechanics, Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1612.02256
Arxiv.org
by Neil J. Robinson; Fabian H. L. Essler; Ivelisse Cabrera; Radu Coldea
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We present experimental and theoretical evidence that an interesting quantum many-body effect -- quasi-particle breakdown -- occurs in the quasi-one-dimensional spin-1/2 Ising-like ferromagnet CoNb$_2$O$_6$ in its paramagnetic phase at high transverse field as a result of explicit breaking of spin inversion symmetry. We propose a quantum spin Hamiltonian capturing the essential one-dimensional physics of CoNb$_2$O$_6$ and determine the exchange parameters of this model by fitting the calculated...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1407.2794
Arxiv.org
by E. A. Vopilkin; A. V. Chiginev; L. S. Revin; A. N. Tropanova; I. Yu. Shuleshova; A. I. Okhapkin; A. D. Shovkun; A. B. Kulakov; A. L. Pankratov
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The technology of wet etching allowing fabrication of standalone BiSrCaCuO mesa structures was proposed. The produced mesas can be produced much thicker than ones usually being studied. The time required for the fabrication is much smaller in comparison with the standard method of ion milling. The process used is controllable which provides acceptable precision of mesa fabrication. The current-voltage characteristics of the sample showing Josephson nature were obtained. The qualitative...
Topics: Superconductivity, Condensed Matter
Source: http://arxiv.org/abs/1409.3950
Arxiv.org
by Zhen Bi; Yi-Zhuang You; Cenke Xu
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In the last few years a lot of exotic and anomalous topological phases were constructed by proliferating the vortex like topological defects on the surface of the $3d$ topological insulator (TI). In this work, rather than considering topological phases at the boundary, we will study quantum critical points driven by vortex like topological defects. In general we will discuss a $(2+1)d$ quantum phase transition described by the following field theory: $\mathcal{L} = \bar{\psi}\gamma_\mu...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1512.01547
Arxiv.org
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Direction-dependent anisotropic exchange is a common feature of magnetic systems with strong spin-orbit coupling. Here we study the effect of such exchange upon macroscopic magnetic anisotropy for a face-centered-cubic model. By several theoretical techniques, we show that, both in the paramagnetic and ordered phases, the magnetic anisotropy is induced by fluctuations. Moreover, the magnetic anisotropy differs in the paramagnetic and ordered phases: in the paramagnetic phase the susceptibility...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1504.07607
Arxiv.org
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The equations for the equilibrium of a thin elastic ribbon are derived by adapting the classical theory of thin elastic rods. Previously established ribbon models are extended to handle geodesic curvature, natural out-of-plane curvature, and a variable width. Both the case of a finite width (Wunderlich's model) and the limit of small width (Sadowksky's model) are recovered. The ribbon is assumed to remain developable as it deforms, and the direction of the generatrices is used as an internal...
Topics: Physics, Soft Condensed Matter, Classical Physics, Condensed Matter
Source: http://arxiv.org/abs/1403.2094
Arxiv.org
by Yin Shi; Meng Wu; Fan Zhang; Ji Feng
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The characterization and applications of topological insulators depend critically on their protected surface states, which, however, can be obscured by the presence of trivial dangling bond states. Our first principle calculations show that this is the case for the pristine $(111)$ surface of SnTe. Yet, the predicted surface states unfold when the dangling bond states are passivated in proper chemisorption. We further extract the anisotropic Fermi velocities, penetration lengths and anisotropic...
Topics: Mesoscale and Nanoscale Physics, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1412.7734
Arxiv.org
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The collective behavior of a two-dimensional wet granular cluster under horizontal swirling motions is investigated experimentally. Depending on the balance between the energy injection and dissipation, the cluster evolves into various nonequilibrium stationary states with strong internal structure fluctuations with time. Quantitative characterizations of the fluctuations with the bond orientational order parameter $q_{\rm 6}$ reveal power spectra of the form $f^{\alpha}$ with the exponent...
Topics: Nonlinear Sciences, Soft Condensed Matter, Adaptation and Self-Organizing Systems, Condensed Matter
Source: http://arxiv.org/abs/1502.04921
Arxiv.org
by Kartiek Agarwal; Eugene Demler; Ivar Martin
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We study the `flux noise' spectrum of random-bond quantum Heisenberg spin systems using a real-space renormalization group (RSRG) procedure that accounts for both the renormalization of the system Hamiltonian and of a generic probe that measures the noise. For spin chains, we find that the dynamical structure factor $S_q(f)$, at finite wave-vector $q$, exhibits a power-law behavior both at high and low frequencies $f$, with exponents that are connected to one another and to an anomalous...
Topics: Disordered Systems and Neural Networks, Condensed Matter
Source: http://arxiv.org/abs/1506.00643
Arxiv.org
by Jonas Wiedenmann; Erwann Bocquillon; Russell S. Deacon; Simon Hartinger; Oliver Herrmann; Teun M. Klapwijk; Luis Maier; Christopher Ames; Christoph Brüne; Charles Gould; Akira Oiwa; Koji Ishibashi; Seigo Tarucha; Hartmut Buhmann; Laurens W. Molenkamp
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The Josephson effect describes the generic appearance of a supercurrent in a weak link between two superconductors. Its exact physical nature however deeply influences the properties of the supercurrent. Detailed studies of Josephson junctions can reveal microscopic properties of the superconducting pairing (spin-triplet correlations, $d$-wave symmetry) or of the electronic transport (quantum dot, ballistic channels). In recent years, considerable efforts have focused on the coupling of...
Topics: Condensed Matter, Mesoscale and Nanoscale Physics, Superconductivity
Source: http://arxiv.org/abs/1503.05591
Arxiv.org
by A. Zazunov; F. Buccheri; P. Sodano; R. Egger
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We study Majorana devices featuring a competition between superconductivity and multi-channel Kondo physics. Our proposal extends previous work on single-channel Kondo systems to a topologically nontrivial setting of non-Fermi liquid type, where topological superconductor wires (with gap $\Delta$) represent leads tunnel-coupled to a Coulomb-blockaded Majorana box. On the box, a spin degree of freedom with Kondo temperature $T_K$ is nonlocally defined in terms of Majorana states. For $\Delta\gg...
Topics: Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1611.07307
Arxiv.org
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Time-reversal invariance places strong constraints on the properties of the quantum spin Hall edge. One such restriction is the inevitability of dissipation in a Josephson junction between two superconductors formed on such an edge without the presence of interaction. Interactions and spin-conservation breaking are key ingredients for the realization of dissipationless ac Josephson effect on such quantum spin Hall edges. We present a simple quantum impurity model that allows to create a...
Topics: Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1609.02909
Arxiv.org
by Parongama Sen; Purusattam Ray
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We have studied $A+A \rightarrow \emptyset$ reaction-diffusion model on a ring, with a bias $\epsilon$ $(0 \leq \epsilon \leq 0.5)$ of the random walkers $A$ to hop towards their nearest neighbor. Though the bias is local in space and time, we show that it alters the universality class of the problem. The $z$ exponent, which describes the growth of average spacings between the walkers with time, changes from the value 2 at $\epsilon=0$ to the mean-field value of unity for any non-zero...
Topics: Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1409.7541
Arxiv.org
by Myong-Song Ryang; Nam-Hyok Kim; Song-Jin Im
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The adsorption and dissociation of nitrogen molecule on Fe(111) surface is studied by density functional theory calculations. The simulation results show that the molecule needs to acquire parallel orientation with respect to the surface for the adsorption and dissociation. In addition, Fe(111) surface is more active in dissociating N2 than Fe(100) surface due to its morphology. The interaction between antibonding molecular orbitals of N2 and partially filled $3d$ orbitals of Fe atoms on the...
Topics: Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1412.7987
Arxiv.org
by Qiang Gao; Huan-huan Xie; Lei Li; Gang Lei; Jian-Bo Deng; Xian-Ru Hu
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Employing $ab$ $intito$ electronic structure calculations, we have investigated electronic and magnetic properties of the Zr-based quanternary Heusler alloys: ZrCoVIn, ZrFeVGe, ZrCoFeP, ZrCoCrBe and ZrFeCrZ (Z=In and Ga). Our $ab$ $intito$ calculation results show that all the alloys are (or nearly) spin-gapless semiconductors. All the alloys have large band gaps, indicating the stability of them at room temperature. The Slater-Pauling behaviours of these alloys are discussed as well. The...
Topics: Physics, Materials Science, Computational Physics, Condensed Matter
Source: http://arxiv.org/abs/1411.7570
Arxiv.org
by Patrizia Rosa; Davide Sangalli; Giovanni Onida; Alberto Debernardi
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We report on a theoretical study of the electronic, optical and magneto-optical properties of digital ferromagnetic hetero-structures based on $Mn$ $\delta$--doped $GaAs$. We consider different structures corresponding to $Mn$ contents within the range 12-50\% and we study how the system changes as a function of the doping concentration. Our first--principles approach includes the spin-orbit interaction in a fully relativistic pseudopotential scheme and the local fields effect in the...
Topics: Condensed Matter, Materials Science
Source: http://arxiv.org/abs/1502.05863
Arxiv.org
by Emanuele Maggio; Peitao Liu; Michiel J. van Setten; Georg Kresse
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In a recent work, van Setten and coworkers have presented a carefully converged $G_0W_0$ study of 100 closed shell molecules [J. Chem. Theory Comput. 11, 5665 (2015)]. For two different codes they found excellent agreement to within few 10 meV if identical Gaussian basis sets were used. We inspect the same set of molecules using the projector augmented wave method and the Vienna ab initio simulation package (VASP). For the ionization potential, the basis set extrapolated plane wave results...
Topics: Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1610.01853
Arxiv.org
by Andrzej P. Kądzielawa; Agata Bielas; Marcello Acquarone; Andrzej Biborski; Maciej M. Maśka; Józef Spałek
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The hydrogen molecules $H_2$ and $(H_2)_2$ are analyzed with electronic correlations taken into account between the $1s$ electrons exactly. The optimal single-particle Slater orbitals are evaluated in the correlated state of $H_2$ by combining their variational determination with the diagonalization of the full Hamiltonian in the second-quantization language. All electron--ion coupling constants are determined explicitly and their relative importance is discussed. Sizable zero-point motion...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1405.1577
Arxiv.org
by Turan Birol; Kristjan Haule
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Discovery of new transition metal compounds with large spin orbit coupling (SOC) coexisting with strong electron-electron correlation among the $d$ electrons is essential for understanding the physics that emerges from the interplay of these two effects. In this study, we predict a novel class of $J_{eff}=1/2$ Mott insulators in a family of fluoride compounds that are previously synthesized, but not characterized extensively. First principles calculations in the level of all electron Density...
Topics: Strongly Correlated Electrons, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1408.4852
Arxiv.org
by Frank Schweiner; Jörg Main; Günter Wunner; Christoph Uihlein
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When treating the exchange interaction of Wannier excitons, usually only the leading terms of the analytic and the nonanalytic exchange interaction are considered. However, higher order terms can lead to a splitting of exciton states, for which reason a splitting of the $1S$~exciton in cuprous oxide $\left(\mathrm{Cu_{2}O}\right)$ depending on its total momentum $\hbar K$ has been attributed to a $K$ dependent analytic exchange interaction by Dasbach et al [Phys. Rev. Lett. 91, 107401 (2003)]....
Topics: Mesoscale and Nanoscale Physics, Materials Science, Condensed Matter, Quantum Physics
Source: http://arxiv.org/abs/1608.07937
Arxiv.org
by Koushik Ray; Siddhartha Sen
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We discuss means to study topological properties of wavefunctions in a time reversal invariant crystalline system through $K$-groups. The well-known methods for calculating $K$-groups of $G$-bundles over spheres are extended using earlier results in order to deal with wavefunctions defined over toroidal Brillouin zones, following a method due to Nash. The recently discovered topological insulator is considered as an illustrative example.
Topics: High Energy Physics - Theory, Mathematics, Strongly Correlated Electrons, Mathematical Physics,...
Source: http://arxiv.org/abs/1408.4898
Arxiv.org
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Long-range interacting many-body systems exhibit a number of peculiar and intriguing properties. One of those is the scaling of relaxation times with the number $N$ of particles in a system. In this paper I give a survey of results on long-range quantum spin models that illustrate this scaling behaviour, and provide indications for its common occurrence by making use of Lieb-Robinson bounds. I argue that these findings may help in understanding the extraordinarily short equilibration timescales...
Topics: Statistical Mechanics, Condensed Matter, Quantum Physics, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1610.03770
Arxiv.org
by A. Kievsky; N. K. Timofeyuk; M. Gattobigio
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We present the analysis of the $N$-boson spectrum computed using a soft two-body potential the strength of which has been varied in order to cover an extended range of positive and negative values of the two-body scattering length $a$ close to the unitary limit. The spectrum shows a tree structure of two states, one shallow and one deep, attached to the ground-state of the system with one less particle. It is governed by an unique universal function, $\Delta(\xi)$, already known in the case of...
Topics: Physics, Quantum Physics, Quantum Gases, Atomic and Molecular Clusters, Chemical Physics, Nuclear...
Source: http://arxiv.org/abs/1405.2371
Arxiv.org
by Bettina Gertjerenken; Martin Holthaus
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We show how a candidate mean-field amplitude can be constructed from the exact wave function of an externally forced $N$-Boson system. The construction makes use of subsidiary $(N-1)$-particle states which are propagated in time in addition to the true $N$-particle state, but does not involve spontaneous breaking of the $U(1)$ symmetry associated with particle number conservation. Provided the flow in Fock space possesses a property which we call maximum stiffness, or $t$-coherence, the...
Topics: Quantum Gases, Condensed Matter
Source: http://arxiv.org/abs/1508.04117
Arxiv.org
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Explicit expression for the $N$-point free energy distribution function in one dimensional directed polymers in a random potential is derived in terms of the Bethe ansatz replica technique. The obtained result is equivalent to the one derived earlier by Prolhac and Spohn [J. Stat. Mech., 2011, P03020].
Topics: Mathematics, Soft Condensed Matter, Mathematical Physics, Condensed Matter
Source: http://arxiv.org/abs/1410.4167
Arxiv.org
by Y. X. Zhao; Y. Lu
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Recently Weyl fermions have attracted increasing interest in condensed matter physics due to their rich phenomenology originated from their nontrivial monopole charges. Here we present a theory of real Dirac points that can be understood as real monopoles in momentum space, serving as a real generalization of Weyl fermions with the reality being endowed by the $PT$ symmetry. The real counterparts of topological features of Weyl semimetals, such as Nielsen-Ninomiya no-go theorem, $2$D sub...
Topics: Mesoscale and Nanoscale Physics, Materials Science, Condensed Matter, Quantum Gases
Source: http://arxiv.org/abs/1610.06830
Arxiv.org
by Fabio Bagarello; Naomichi Hatano
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We propose a $PT$-symmetrically deformed version of the graphene tight-binding model under a magnetic field. We analyze the structure of the spectra and the eigenvectors of the Hamiltonians around the $K$ and $K'$ points, both in the $PT$-symmetric and $PT$-broken regions. In particular we show that the presence of the deformation parameter $V$ produces several interesting consequences, including the asymmetry of the zero-energy states of the Hamiltonians and the breakdown of the completeness...
Topics: Mesoscale and Nanoscale Physics, Mathematical Physics, Condensed Matter, Mathematics
Source: http://arxiv.org/abs/1609.00665
Arxiv.org
by Hironori Yamaguchi; Yasuhiro Shinpuku; Tokuro Shimokawa; Kenji Iwase; Toshio Ono; Yohei Kono; Shunichiro Kittaka; Toshiro Sakakibara; Yuko Hosokoshi
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We successfully synthesized the zinc-verdazyl complex [Zn(hfac)$_2$]$\cdot$($o$-Py-V) [hfac = 1,1,1,5,5,5-hexafluoroacetylacetonate; $o$-Py-V = 3-(2-pyridyl)-1,5-diphenylverdazyl], which is an ideal model compound with an $S$ = 1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chain (F-AF AHC). $Ab$ $initio$ molecular orbital (MO) calculations indicate that two dominant interactions $J_{\rm{F}}$ and $J_{\rm{AF}}$ form the $S=1/2$ F-AF AHC in this compound. The magnetic susceptibility...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1502.06804
Electric-magnetic duality ($S$-duality) is a well-known property of pure $u(1)$ gauge theory in 3+1 dimensions. In this paper, we investigate the compatibility of this duality with time-reversal symmetry. We consider two theories obtained by coupling a Dirac fermion with an "inverted" sign of the mass $m$ to a $u(1)$ gauge field. Time-reversal in the two theories is implemented respectively via the $T$ and $CT$ symmetries of the Dirac fermion. It was recently conjectured (C. Wang and...
Topics: Strongly Correlated Electrons, Condensed Matter, High Energy Physics - Theory
Source: http://arxiv.org/abs/1510.05663
Arxiv.org
by Ming-Yong Ye; Xiu-Min Lin
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Two-dimensional Hubbard model is very important in condensed matter physics. However it has not been resolved though it has been proposed for more than 50 years. We give several methods to construct eigenstates of the model that are independent of the on-site interaction strength $U$.
Topics: Superconductivity, Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1606.08364
Arxiv.org
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We study a spin dependent Tomonaga-Luttinger model in one dimension, which describes electron transport through a single barrier. Using the Fermi-Bose equivalence in one dimension, we map the model onto a massless Thirring model with a boundary interaction. A field theoretical perturbation theory for the model has been developed and the chiral symmetry is found to play an important role. The classical bulk action possesses a global $U_A(1)^4$ chiral symmetry, since the fermion fields are...
Topics: Strongly Correlated Electrons, Condensed Matter, High Energy Physics - Theory
Source: http://arxiv.org/abs/1510.01054
Arxiv.org
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We propose in this paper an effective low-energy theory for interacting fermion systems which supports exclusion statistics. The theory can be viewed as an extension of Landau Fermi liquid theory where besides quasi-particle energy $\xi_{\mathbf{k}}$, the kinetic momentum $\mathbf{k}$ of quasi-particles depends also on quasi-particle occupation numbers as a result of momentum ($k$)-dependent current-current interaction. The dependence of kinetic momentum on quasi-particles excitations leads to...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1610.08633
Arxiv.org
by Zheng-Xin Liu; Jia-Wei Mei; Peng Ye; Xiao-Gang Wen
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Gutzwiller projection is a way to construct many-body wave functions that could carry topological order or symmetry protected topological (SPT) order. However, an important issue is to determine whether or not a given Gutzwiller-projected wave functions (GWF) carries a non-trivial SPT order, and which SPT order is carried by the wavefunction. In this paper, we numerically study the SPT order in a spin $S = 1$ GWF on the Kagome lattice. Using the standard Monte Carlo method, we directly confirm...
Topics: Quantum Physics, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1408.1676
Arxiv.org
by Frédéric Bègue; Pierre Pujol; Revaz Ramazashvili
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A two-dimensional topological insulator may arise in a centrosymmetric commensurate N\'{e}el antiferromagnet (AF), where staggered magnetization breaks both the elementary translation and time reversal, but retains their product as a symmetry. Fang et al.[Phys. Rev. B 88, 085406 (2013)] proposed an expression for a $Z_2$ topological invariant to characterize such systems. Here, we show that this expression does not allow to detect all the existing phases if a certain lattice symmetry is...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1605.08291
Arxiv.org
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The infinite dimensional half-filled Hubbard model can be mapped exactly with no additional constraint onto a model of free fermions coupled in a $Z_2$ gauge-invariant manner to auxiliary Ising spins in a transverse field. In this slave-spin representation, the zero-temperature insulator-to-metal transition translates into spontaneous breaking of the local $Z_2$ gauge symmetry, which is not forbidden in infinite dimensions, thus endowing the Mott transition of an order parameter that is...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1504.01521
Arxiv.org
by Abolhassan Vaezi
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We generalize the Kitaev's spin-1/2 model on the honeycomb by introducing a two-dimensional $Z_3$ clock model on the triangular lattice with three body interaction. We discuss various properties of this model and show that the low energy theory of the $Z_3$ generalized Kitaev model (GKM) is described by a single $Z_3$ parafermion per lattice site coupled to a $Z_3$ gauge field. We also introduce a slave-fermion approach for this GKM, treat the resulting fermionic Hamiltonian at the mean-field...
Topics: Strongly Correlated Electrons, Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1405.1721
Arxiv.org
by Owen Myers; C. M. Herdman
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We introduce the quantum dimer-pentamer model (QDPM) on the square lattice. This model is a generalization of the square lattice quantum dimer model as its configuration space comprises fully-packed hard-core dimer coverings as well as dimer configurations containing pentamers, where four dimers touch a vertex. Thus in the QDPM, the fully-packed, hard-core constraint of the quantum dimer model is relaxed such that the local dimer number at each vertex is fixed modulo 3, resulting in an exact...
Topics: Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1704.02063
Arxiv.org
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We present a new tractable quantum Rabi model for $N$-level atoms by extending the $\mathbb Z_2$ symmetry of the two-state Rabi model. The Hamiltonian is $\mathbb Z_N$ symmetric and allows the parameters in the level separation terms to be complex while remaining hermitian. This latter property means that the new model is {\em chiral}, which makes it differ from any existing $N$-state Rabi models in the literature. The $\mathbb Z_N$ symmetry provides partial diagonalization of the general...
Topics: Quantum Physics, Mathematics, Other Condensed Matter, Mathematical Physics, Condensed Matter
Source: http://arxiv.org/abs/1403.4737
Arxiv.org
by Toshihiro Nomura; Yoshimitsu Kohama; Yasuhiro H. Matsuda; Koichi Kindo; Tatsuo C. Kobayashi
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The magnetic-field-temperature phase diagram of solid oxygen is investigated by the adiabatic magnetocaloric effect (MCE) measurement with pulsed magnetic fields. Relatively large temperature decrease with hysteresis is observed at just below the $\beta$-$\gamma$ and $\alpha$-$\beta$ phase transition temperatures owing to the field-induced transitions. The magnetic field dependences of these phase boundaries are obtained as $T_\mathrm{\beta\gamma}(H)=43.8-1.55\times10^{-3}H^2$ K and...
Topics: Materials Science, Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1701.05096
Arxiv.org
by K. W. Plumb; J. P. Clancy; L. Sandilands; V. Vijay Shankar; Y. F. Hu; K. S. Burch; Hae-Young Kee; Young-June Kim
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We examine the role of spin-orbit coupling in the electronic structure of $\alpha$-RuCl3, in which Ru ions in 4d5 configuration form a honeycomb lattice. The measured optical spectra exhibit a clear optical gap and excitations within the t2g orbitals. The spectra can be described very well with first-principles electronic structure calculations obtained by taking into account both spin orbit coupling and electron correlations. Furthermore, our X-ray absorption spectroscopy measurements at the...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1403.0883
Arxiv.org
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The nature of the elemental cerium phases, undergoing an isostructural volume collapse transition, cannot be understood using conventional solid state concepts. Using the combination of density functional theory and dynamical mean-field theory, we study the magnetic properties of both the $\alpha$ and the $\gamma$ phases. We compute the magnetic form factor, and show that it is very close to free ion behavior in both the local moment $\gamma$ phase as well as the more itinerant $\alpha$ phase,...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1401.1245
Arxiv.org
by Su-Chan Park; Joachim Krug
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We study a modified record process where the $k$'th record in a series of independent and identically distributed random variables is defined recursively through the condition $Y_k > Y_{k-1} - \delta_{k-1}$ with a deterministic sequence $\delta_k > 0$ called the handicap. For constant $\delta_k \equiv \delta$ and exponentially distributed random variables it has been shown in previous work that the process displays a phase transition as a function of $\delta$ between a normal phase where...
Topics: Quantitative Biology, Statistical Mechanics, Condensed Matter, Populations and Evolution
Source: http://arxiv.org/abs/1603.05102
Arxiv.org
by X. Montiel; T. Kloss; C. Pépin; S. Benhabib; Y. Gallais; A. Sacuto
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We discuss the possible existence a spin singlet excitation with charge $\pm2$ ($\eta$-mode) originating the $A_{1g}$ Raman resonance in cuprate superconductors. This $\eta$-mode relates the $d$-wave superconducting singlet pairing channel to a $d$-wave charge channel. We show that the $\eta$ boson forms a particle-particle bound state below the $2\Delta$ threshold of the particle-hole continuum where $\Delta$ is the maximum $d$-wave gap. Within a generalized random phase approximation and...
Topics: Condensed Matter, Superconductivity
Source: http://arxiv.org/abs/1504.03951
Arxiv.org
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We propose a novel possibility of dynamically changing the pairing of superconductors from $s$ wave to $\eta$ pairing (where the pairs condense at the Brillouin-zone corner momenta) by driving the system with ac fields. We consider a periodically-driven attractive Hubbard model in the strong-coupling regime, and show that the pair-hopping and pair-repulsion terms in the effective Hamiltonian in the Floquet formalism are drastically renormalized in different manners between the two terms, which...
Topics: Superconductivity, Quantum Gases, Condensed Matter
Source: http://arxiv.org/abs/1511.07890
Arxiv.org
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Many-body theory is developed to calculate the $\gamma$-spectra for positron annihilation with valence and core electrons in the noble gas atoms. A proper inclusion of correlation effects and core annihilation provides for an accurate description of the measured spectra [Iwata \textit{et al.}, Phys. Rev. Lett. {\bf 79}, 39 (1997)]. The theory enables us to calculate the enhancement factors $\gamma_{nl}$, which describe the effect of electron-positron correlations for annihilation on individual...
Topics: Physics, Atomic Physics, Other Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1406.4323
Arxiv.org
by C. Repellin; B. Andrei Bernevig; N. Regnault
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We propose a simple microscopic model to numerically investigate the stability of a two dimensional fractional topological insulator (FTI). The simplest example of a FTI consists of two decoupled copies of a Laughlin state with opposite chiralities. We focus on bosons at half filling. We study the stability of the FTI phase upon addition of two coupling terms of different nature: an interspin interaction term, and an inversion symmetry breaking term that couples the copies at the single...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1402.2652
Arxiv.org
by Diana Prychynenko; Sebastian D. Huber
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We calculate the phase diagram of the topological honeycomb model in the presence of strong interactions. We concentrate on half filling and employ a ${\mathbb Z}_{2}$ slave-spin method to find a band insulator with staggered density, a spin-density-wave and a Mott insulating phase. Both the band insulator and the spin-density wave come in various topological varieties. Finally, we calculate the response function relevant for lattice modulation spectroscopy with cold atomic gases in optical...
Topics: Quantum Gases, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1410.2001
Arxiv.org
by Desmond A. Johnston
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$2$-form abelian and non-abelian gauge fields on $d$-dimensional hypercubic lattices have been discussed in the past by various authors and most recently by Lipstein and Reid-Edwards. In this note we recall that the Hamiltonian of a $\mathbb{Z}_2$ variant of such theories is one of the family of generalized Ising models originally considered by Wegner. For such "$\mathbb{Z}_2$ lattice gerbe theories" general arguments can be used to show that a phase transition for Wilson surfaces...
Topics: High Energy Physics - Theory, Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1405.7890
Arxiv.org
by Kyusung Hwang; Yejin Huh; Yong Baek Kim
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We present an effective $\mathbb{Z}_2$ gauge theory that captures various competing phases in spin-1/2 kagome lattice antiferromagnets: the topological $\mathbb{Z}_2$ spin liquid (SL) phase, and the 12-site and 36-site valence bond solid (VBS) phases. Our effective theory is a generalization of the recent $\mathbb{Z}_2$ gauge theory proposed for SL phases by Wan and Tchernyshyov. In particular, we investigate possible VBS phases that arise from vison condensations in the SL. In addition to the...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1507.04747
Arxiv.org
by Taher Amlaki; Menno Bokdam; Paul J. Kelly
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We present a low energy Hamiltonian generalized to describe how the energy bands of germanene ($\rm \overline{Ge}$) are modified by interaction with a substrate or a capping layer. The parameters that enter the Hamiltonian are determined from first-principles relativistic calculations for $\rm \overline{Ge}|$MoS$_2$ bilayers and MoS$_2|\rm \overline{Ge} |$MoS$_2$ trilayers and are used to determine the topological nature of the system. For the lowest energy, buckled germanene structure, the gap...
Topics: Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1606.08290
Arxiv.org
by Domenico Fiorenza; Domenico Monaco; Gianluca Panati
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We consider a gapped periodic quantum system with time-reversal symmetry of fermionic (or odd) type, i.e. the time-reversal operator squares to -1. We investigate the existence of periodic and time-reversal invariant Bloch frames in dimensions 2 and 3. In 2d, the obstruction to the existence of such a frame is shown to be encoded in a $\mathbb{Z}_2$-valued topological invariant, which can be computed by a simple algorithm. We prove that the latter agrees with the Fu-Kane index. In 3d, instead,...
Topics: Mathematics, Mesoscale and Nanoscale Physics, Mathematical Physics, Condensed Matter
Source: http://arxiv.org/abs/1408.1030
Arxiv.org
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Parafermionic zero modes are a novel set of excitations displaying non-Abelian statistics somewhat richer than that of Majorana modes. These modes are predicted to occur when nearby fractional quantum Hall edge states are gapped by an interposed superconductor. Despite substantial experimental progress, we argue that the necessary crossed Andreev reflection in this arrangement is a challenging milestone to reach. We propose a superconducting quantum dot array structure on a fractional quantum...
Topics: Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1612.01548
Arxiv.org
by Chris J. Pedder; Tobias Meng; Rakesh P. Tiwari; Thomas L. Schmidt
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We demonstrate the appearance of zero-energy bound states satisfying the $\mathbb{Z}_4$ parafermionic algebra in interacting quantum wires with Rashba spin-orbit coupling and proximity-induced superconductivity. The fourfold degeneracy of these states is protected by time-reversal symmetry and fermion-parity conservation, and leads to an $8 \pi$ periodicity of the Josephson current due to the tunneling of fractionalized excitations with charge $e/2$. Even in the presence of perturbations, we...
Topics: Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1507.08881
Arxiv.org
by Tiago E. de Oliveira; Paulo A. Netz; Kurt Kremer; Christoph Junghans; Debashish Mukherji
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We present a coarse-graining strategy that we test for aqueous mixtures. The method uses pair-wise cumulative coordination as a target function within an iterative Boltzmann inversion (IBI) like protocol. We name this method coordination iterative Boltzmann inversion ($\mathcal {C}-$IBI). While the underlying coarse-grained model is still structure based and, thus, preserves pair-wise solution structure, our method also reproduces solvation thermodynamics of binary and/or ternary mixtures....
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.08787
Arxiv.org
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We study the $\mathcal{PT} $-symmetry breaking for the scattering problem in a one-dimensional (1D) non-Hermitian tight-binding lattice model with balanced gain and loss distributed on two adjacent sites. In the scattering process the system undergoes a transition from the exact $\mathcal{PT} $-symmetry phase to the phase with spontaneously breaking $\mathcal{PT} $-symmetry as the amplitude of complex potentials increases. Using the S-matrix method, we derive an exact discriminant, which can be...
Topics: Quantum Physics, Other Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1510.06938
Arxiv.org
by Silvio Savoia; Giuseppe Castaldi; Vincenzo Galdi; Andrea Alù; Nader Engheta
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Inspired by the parity-time symmetry concept, we show that a judicious spatial modulation of gain and loss in epsilon-near-zero metamaterials can induce the propagation of exponentially-bound interface modes characterized by zero attenuation. With specific reference to a bi-layer configuration, via analytical studies and parameterization of the dispersion equation, we show that this waveguiding mechanism can be sustained in the presence of moderate gain/loss levels, and it becomes leaky (i.e.,...
Topics: Optics, Physics, Mesoscale and Nanoscale Physics, Condensed Matter, Materials Science
Source: http://arxiv.org/abs/1502.05495
Arxiv.org
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Aubry-Andre Harper (AAH) lattice models, characterized by reflection-asymmetric, sinusoidally varying nearest-neighbor tunneling profile, are well-known for their topological properties. We consider the fate of such models in the presence of balanced gain and loss potentials $\pm i\gamma$ located at reflection-symmetric sites. We predict that these models have a finite $\mathcal{PT}$ breaking threshold only for {\it specific locations} of the gain-loss potential, and uncover a hidden symmetry...
Topics: Condensed Matter, Quantum Physics, Quantum Gases, Optics, Physics
Source: http://arxiv.org/abs/1504.03767
Arxiv.org
by Daniel Haag; Dennis Dast; Holger Cartarius; Günter Wunner
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We study the case of $\mathcal{PT}$-symmetric perturbations of Hermitian Hamiltonians with degenerate eigenvalues using the example of a triple-well system. The degeneracy complicates the question, whether or not a stationary current through such a system can be established, i.e.\ whether or not the $\mathcal{PT}$-symmetric states are stable. It is shown that this is only the case for perturbations that do not couple to any of the degenerate states. The physical explanation for the inhibition...
Topics: Quantum Physics, Quantum Gases, Condensed Matter
Source: http://arxiv.org/abs/1509.07382
Arxiv.org
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One of the most fundamental problems in quantum many-body systems is the identification of a mean field in spontaneous symmetry breaking which is usually made in a heuristic manner. We propose a systematic method of finding a mean field based on the Lie algebra and the dynamical symmetry by introducing a class of symmetry broken phases which we call $\mu$-symmetry breaking. We show that for $\mu$-symmetry breaking the quadratic part of an effective Lagrangian of Nambu-Goldstone modes can be...
Topics: Condensed Matter, Quantum Gases
Source: http://arxiv.org/abs/1504.08113
Arxiv.org
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Recent analysis of well-tempered metadynamics (WTmetaD) showed that it converges without mollification artifacts in the bias potential. Here we explore how metadynamics heals mollification artifacts, how healing impacts convergence time, and whether alternative temperings may be used to improve efficiency. We introduce "$\mu$-tempered" metadynamics as a simple tempering scheme, inspired by a related mollified adaptive biasing potential (mABP), that results in artifact independent...
Topics: Soft Condensed Matter, Computational Physics, Chemical Physics, Condensed Matter, Physics
Source: http://arxiv.org/abs/1511.00558
Arxiv.org
by Ladislav Svoboda; Stanislav Šulc; Tomáš Janda; Jan Vorel; Jan Novák
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The paper presents the project of an open source C/C++ library of analytical solutions to micromechanical fields within media with ellipsoidal heterogeneities. The solutions are based on Eshelby's stress-free, in general polynomial, eigenstrains and equivalent inclusion method. To some extent, the interactions among inclusions in a non-dilute medium are taken into account by means of the self-compatibility algorithm. Moreover, the library is furnished with a powerful I/O interface and...
Topics: Materials Science, Condensed Matter, Computational Physics, Physics
Source: http://arxiv.org/abs/1602.05421
Arxiv.org
by M. Gomilsek; M. Klanjsek; M. Pregelj; H. Luetkens; Y. Li; Q. M. Zhang; A. Zorko
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Impurities, which are inherently present in any real material, may play an important role in the magnetism of frustrated spin systems with spin-liquid ground states. We address the impurity issue in quantum kagome antiferromagnets by investigating ZnCu$_3$(OH)$_6$SO$_4$ (Zn-brochantite) by means of muon spin spectroscopy. We show that muons couple to the impurity magnetism, originating from Cu-Zn intersite disorder, and that the impurities are highly correlated with the kagome spins, allowing...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1604.02916