Ground-state properties of a one-dimensional strongly interacting Bose-Fermi mixture in a double-well potential
K. Lelas, D. Jukic, and H. Buljan
We calculate the reduced single-particle density matrix (RSPDM), momentum distribution, natural orbitals and their occupancies, for a strongly repulsive one-dimensional Bose-Fermi mixture in a double-well potential with a large central barrier. We assume that all particles have the same mass, and fe ... [Phys. Rev. A 80, 053617 (2009)] published Thu Nov 19, 2009.
Single-particle density matrix for a time-dependent strongly interacting one-dimensional Bose gas
R. Pezer, T. Gasenzer, and H. Buljan
We derive a 1/c expansion for the single-particle density matrix of a strongly interacting time-dependent one-dimensional Bose gas, described by the Lieb-Liniger model (c denotes the strength of the interaction). The formalism is derived by expanding Gaudin's Fermi-Bose mapping operator up to 1/c te ... [Phys. Rev. A 80, 053616 (2009)] published Thu Nov 19, 2009.
Measurement of anharmonicity of phonons in the negative thermal expansion compound Zn(CN) by high pressure inelastic neutron scattering
R. Mittal, S. L. Chaplot, and H. Schober
Zn(CN) is known to have an isotropic negative thermal expansion (NTE) coefficient (about 51 x 10 K) over 10370 K that is twice as large as that of ZrWO. We have measured the pressure dependence of the phonon spectra up to 30 meV from a polycrystalline sample of Zn(CN) at pressures of 0, 0.3, 1.9, a ... [Appl. Phys. Lett. 95, 201901 (2009)] published Mon Nov 16, 2009.
Transverse instabilities of multiple vortex chains in magnetically coupled NbSe/permalloy superconductor/ferromagnet bilayers
G. Karapetrov, M. V. Milosevic, M. Iavarone, J. Fedor, A. Belkin et al.
Using scanning tunneling microscopy and Ginzburg-Landau simulations, we explore vortex configurations in magnetically coupled NbSe/permalloy superconductor/ferromagnet bilayer. The permalloy film with stripe domain structure induces periodic local magnetic induction in the superconductor, creating a ... [Phys. Rev. B 80, 180506 (2009)] published Mon Nov 16, 2009.
Spontaneous antiferromagnetic long-range order in the two-dimensional hybrid model of localized Ising spins and itinerant electrons
Jozef StreCka, Akinori Tanaka, Lucia Canova, and Taras Verkholyak
The generalized decoration-iteration transformation is adopted to treat exactly a hybrid model of doubly decorated two-dimensional lattices, which have localized Ising spins at their nodal lattice sites and itinerant electrons delocalized over pairs of decorating sites. Under the assumption of a hal ... [Phys. Rev. B 80, 174410 (2009)] published Mon Nov 16, 2009.
Energy relaxation probed by weak antilocalization measurements in GaN heterostructures
H. Cheng, N. Biyikli, J. Xie, C. Kurdak, and H. Morkoc
Energy relaxation and electron-phonon (e-p) interaction are investigated in wurtzite AlGaN/AlN/GaN and AlInN/AlN/GaN heterostructures with polarization induced two-dimensional electron gases in the BlochGruneisen regime. Weak antilocalization (WAL) and Shubnikovde Haas measurements were performed on ... [J. Appl. Phys. 106, 103702 (2009)] published Mon Nov 16, 2009.
Elasticity and Response in Nearly Isostatic Periodic Lattices
Anton Souslov, Andrea J. Liu, and T. C. Lubensky
The square and kagome lattices with nearest-neighbor springs of spring constant k are isostatic with a number of zero-frequency modes that scale with their perimeter. We analytically study the approach to this isostatic limit as the spring constant k for next-nearest-neighbor bonds vanishes. We iden ... [Phys. Rev. Lett. 103, 205503 (2009)] published Fri Nov 13, 2009.
Bending affects entropy of semiflexible polymers: Application to protein-DNA complexes
Shay M. Rappaport and Yitzhak Rabin
We discuss a class of generalized wormlike chain models of polymers with spontaneous curvature and show that the density of states and consequently the entropy of such natively bent polymers are higher than that of straight ones. This effect changes the classical Langmuir binding isotherm by giving ... [Phys. Rev. E 80, 052801 (2009)] published Thu Nov 12, 2009.
Microcanonical finite-size scaling in second-order phase transitions with diverging specific heat
L. A. Fernandez, A. Gordillo-Guerrero, V. Martin-Mayor, and J. J. Ruiz-Lorenzo
A microcanonical finite-size ansatz in terms of quantities measurable in a finite lattice allows extending phenomenological renormalization (the so-called quotients method) to the microcanonical ensemble. The ansatz is tested numerically in two models where the canonical specific heat diverges at cr ... [Phys. Rev. E 80, 051105 (2009)] published Fri Nov 6, 2009.
Role of temperature effects in the phenomenon of ultraslow electromagnetic pulses in Bose-Einstein condensates of alkali-metal atoms
Yurii Slyusarenko and Andrii Sotnikov
We study the temperature dependence of optical properties of dilute gases of alkali-metal atoms in the state with Bose-Einstein condensates. The description is constructed in the framework of the microscopic approach that is based on the Green's-functions formalism. We find the expressions for the s ... [Phys. Rev. A 80, 053604 (2009)] published Fri Nov 6, 2009.
Phase transitions in traffic flow on multilane roads
Boris S. Kerner and Sergey L. Klenov
Based on empirical and numerical analyses of vehicular traffic, the physics of spatiotemporal phase transitions in traffic flow on multilane roads is revealed. The complex dynamics of moving jams observed in single vehicle data measured by video cameras on American highways is explained by the nucle ... [Phys. Rev. E 80, 056101 (2009)] published Wed Nov 4, 2009.
SU(N) Heisenberg model on the square lattice: A continuous-N quantum Monte Carlo study
K. S. D. Beach, Fabien Alet, Matthieu Mambrini, and Sylvain Capponi
A quantum phase transition is typically induced by tuning an external parameter that appears as a coupling constant in the Hamiltonian. Another route is to vary the global symmetry of the system, generalizing, e.g., SU(2) to SU(N). In that case, however, the discrete nature of the control parameter ... [Phys. Rev. B 80, 184401 (2009)] published Mon Nov 2, 2009.
Density dynamics in translationally invariant spin-(1/2) chains at high temperatures: A current-autocorrelation approach to finite time and length scales
Robin Steinigeweg and Jochen Gemmer
We investigate transport in several translationally invariant spin-(1/2) chains in the limit of high temperatures. We concretely consider spin transport in the anisotropic Heisenberg chain, the pure Heisenberg chain within an alternating field, and energy transport in an Ising chain which is exposed ... [Phys. Rev. B 80, 184402 (2009)] published Mon Nov 2, 2009.
Dynamics of colloids in a narrow channel driven by a nonuniform force
D. V. Tkachenko, V. R. Misko, and F. M. Peeters
Using Brownian dynamics simulations, we investigate the dynamics of colloids confined in two-dimensional narrow channels driven by a nonuniform force F(y). We considered linear-gradient, parabolic, and deltalike driving-force profiles. This driving force induces melting of the colloidal solid (i.e., ... [Phys. Rev. E 80, 051401 (2009)] published Mon Nov 2, 2009.
Six-state clock model on the square lattice: Fisher zero approach with Wang-Landau sampling
Chi-Ok Hwang
We investigate the six-state clock model with nearest-neighbor interactions on the square lattice. We obtain the density of states of the finite systems up to L=28 using the Wang-Landau sampling. With the density of states and the Fisher zero approach, we successfully find two different critical tem ... [Phys. Rev. E 80, 042103 (2009)] published Thu Oct 29, 2009.
Mapping Kitaev's quantum double lattice models to Levin and Wen's string-net models
Oliver Buerschaper and Miguel Aguado
We exhibit a mapping identifying Kitaev's quantum double lattice models explicitly as a subclass of Levin and Wen's string-net models via a completion of the local Hilbert spaces with auxiliary degrees of freedom. This identification allows one to carry over to these string-net models the representa ... [Phys. Rev. B 80, 155136 (2009)] published Wed Oct 28, 2009.
Fluctuations of Ionic Current Through Lipid Bilayers at the Onset of Peptide Attacks and Pore Formation
G. C. Fadda, D. Lairez, and G. Zalczer
Voltage-clamp measurements on lipid bilayers at the onset of peptide attacks before pore formation are reported. With four different peptides [alamethicin, melittin, and two synthetic peptides of the leucine (L)lysine(K) copolymers (LK series)], correlations of conductivity fluctuations slowly decay ... [Phys. Rev. Lett. 103, 180601 (2009)] published Tue Oct 27, 2009.
Nonequilibrium Monte Carlo simulation for a driven Brownian particle
Phil Attard
The author's nonequilibrium probability distribution is tested for time-varying mechanical work. Nonequilibrium Monte Carlo (NEMC) is used to simulate a Brownian particle in a soft-sphere solvent, driven by a moving external potential. Results are obtained for the phase lag and amplitude for drive f ... [Phys. Rev. E 80, 041126 (2009)] published Fri Oct 23, 2009.
Softening behavior of the ferroelectric A(TO) phonon near the Curie temperature
Hyun Myung Jang, Min-Ae Oak, Jung-Hoon Lee, Young Kyu Jeong, and James F. Scott
It is well known that the A(TO) phonon with its eigenvector parallel to the unique c axis of the 4mm symmetry is primarily responsible for the manifestation of displacive ferroelectricity in ABO-type perovskites. We have theoretically examined the softening behavior of this A(TO) phonon, particularl ... [Phys. Rev. B 80, 132105 (2009)] published Thu Oct 22, 2009.
Improving fast-switching free energy estimates by dynamical freezing
Paolo Nicolini and Riccardo Chelli
An important limitation of nonequilibrium pulling experiments/simulations in recovering free energy differences is the poor convergence of path-ensemble averages. Therefore, a large number of fast-switching trajectories needs to achieve free energy estimates with acceptable accuracy. We propose a me ... [Phys. Rev. E 80, 041124 (2009)] published Thu Oct 22, 2009.
Interaction times in the Xe+Xe and U+U reactions with a quantum master equation
V. V. Sargsyan, Z. Kanokov, G. G. Adamian, N. V. Antonenko, and W. Scheid
Using the reduced-density-matrix formalism, the interaction time of two heavy nuclei is studied. In the reactions Xe+Xe and U+U, the mean interaction time and variance of interaction time distribution are calculated and compared with those of other treatments. ... [Phys. Rev. C 80, 047603 (2009)] published Mon Oct 19, 2009.
Cooperative jump motions of jammed particles in a one-dimensional periodic potential. (arXiv:0911.3703v1 [cond-mat.stat-mech])
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Asymptotic forms and scaling properties of the relaxation time near threshold points in spinodal type dynamical phase transitions. (arXiv:0911.3748v1 [cond-mat.stat-mech])
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Quantum Phase Transitions in Alternating-Bond Mixed Diamond Chains with Spins 1 and 1/2. (arXiv:0911.3838v1 [cond-mat.str-el])
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Monte Carlo Study of the Axial Next-Nearest-Neighbor Ising Model. (arXiv:0911.3846v1 [cond-mat.stat-mech])
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Universal power laws in the threshold network model: A theoretical analysis based on extreme value theory. (arXiv:0911.3864v1 [cond-mat.stat-mech])
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Hitting probability for anomalous diffusion processes. (arXiv:0911.3815v1 [cond-mat.stat-mech])
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Mutual information via thermodynamics: Three different approaches. (arXiv:0911.3751v1 [cond-mat.stat-mech])
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Stochastic Processes Crossing from Ballistic to Fractional Diffusion with Memory: Exact Results. (arXiv:0911.3770v1 [cond-mat.stat-mech])
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Mean-field theory of orientational ordering in rigid rotor models with identical atoms: spin conversion and thermal equilibration. (arXiv:0911.3780v1 [cond-mat.stat-mech])
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Stability of Binary Mixtures in Electric Field Gradients. (arXiv:0907.4855v2 [cond-mat.stat-mech] UPDATED)
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Correlation functions of the integrable higher-spin XXX and XXZ spin chains through the fusion method. (arXiv:0907.0582v3 [cond-mat.stat-mech] UPDATED)
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Limit process of stationary TASEP near the characteristic line. (arXiv:0907.0226v2 [math-ph] UPDATED)
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Dielectric Breakdown in a Mott Insulator: Many-body Schwinger-Landau-Zener Mechanism studied with a Generalized Bethe Ansatz. (arXiv:0903.2707v3 [cond-mat.stat-mech] UPDATED)
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Layering in the Ising model. (arXiv:0911.2105v2 [cond-mat.stat-mech] UPDATED)
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