Skip to content

Condensed Matter papers — page 37

cond-matBrowse archive

Superfluid--Insulator Transition in Commensurate Disordered Bosonic Systems:Large-Scale Worm-Algorithm Simulations
We report results of large-scale Monte Carlo simulations of superfluid--insulator transitions in commensurate 2D bosonic systems. In the case of off-diagonal disorder (quantum percolation), we find…
Nikolay Prokof'ev, Boris SvistunovJan 13, 2003
Learn
Low-density, one-dimensional quantum gases in a split trap
We investigate degenerate quantum gases in one dimension trapped in a harmonic potential that is split in the centre by a pointlike potential. Since the single particle eigenfunctions of such a…
Th. Busch, G. HuyetJan 13, 2003
Learn
Expansion of a quantum degenerate boson-fermion mixture
We study the expansion of an ultracold boson-fermion mixture released from an elongated magnetic trap, in the context of a recent experiment at LENS (G. Roati et al., Phys. Rev. Lett. 89, 150403…
Hui Hu, Xia-Ji Liu, Michele ModugnoJan 13, 2003
Learn
Memory effects in Amorphous Solids below 20 mK
At temperatures below 1 K, the capacitance of a glass sample changes due to the application of a DC field in accordance with A. Burins dipole gap theory. However, we now report that below 20 mK,…
D. Rosenberg, P. Nalbach, D. D. OsheroffJan 13, 2003
Learn
System of particles with interaction and the cluster formation in condensed matter
We investigate the behaviour of a system of particles with the different character of interaction. The approach makes it possible to describe systems of interacting particles by statistical methods…
Volodymyr Krasnoholovets, Bohdan LevJan 13, 2003
Learn
Quantum phase diffusions of a spinor condensate
We discuss the quantum phases and their diffusion in a spinor-1 atomic Bose-Einstein condensate. For ferromagnetic interactions, we obtain the exact ground state distribution of the phase…
S. Yi, Ö. E. Müstecaplıoğlu, L. YouJan 12, 2003
Learn
Model of Inhomogeneous Impurity Distribution in Fermi Superfluids
The standard treatment of impurities in metals assumes a homogeneous distribution of impurities. In this paper we study distributions that are inhomogeneous. We discuss in detail the "isotropic…
R. Hänninen, E. V. ThunebergJan 10, 2003
Learn
Deposition of magnetic particles: A computer simulation study
We report a Monte Carlo simulation of deposition of magnetic particles on a one-dimensional substrate. Incoming particles interact with those that are already part of the deposit via a dipole-dipole…
F. de los Santos, M. Tasinkevych, J. M. Tavares et al.Jan 10, 2003
Learn
Ferromagnetic phase transitions of inhomogeneous systems modelled by square Ising models with diamond-type bond-decorations
The two-dimensional Ising model defined on square lattices with diamond-type bond-decorations is employed to study the nature of the ferromagnetic phase transitions of inhomogeneous systems. The…
Ming-Chang Huang, Yu-Pin Luo, Tsong-Ming LiawJan 10, 2003
Learn
Enhancement of the electron electric dipole moment in gadolinium garnets
Effects caused by the electron electric dipole moment (EDM) in gadolinium garnets are considered. Experimental studies of these effects could improve current upper limit on the electron EDM by…
T. N. Mukhamedjanov, V. A. Dzuba, O. P. SushkovJan 10, 2003
Learn
Entanglement and decoherence in near-critical qubit chains
We study the problem of environmentally-induced decoherence in a near-critical one-dimensional system of N>>1 coupled qubits. Using the Jordan-Wigner fermion representation of the qubit operators we…
D. V. KhveshchenkoJan 9, 2003
Learn
Halogen-mediated exchange in the coupled-tetrahedra quantum spin systems Cu2Te2O5X2 (X=Br,Cl)
Motivated by recent discussion on possible quantum critical behavior in the coupled Cu-tetrahedra system Cu2Te2O5Br2, we present a comparative ab initio study of the electronic properties of…
Roser Valenti, T. Saha-Dasgupta, Claudius Gros et al.Jan 9, 2003
Learn
Phonons in supercooled liquids: a possible explanation for the Boson Peak
Glasses are amorphous solids, in the sense that they display elastic behaviour. In crystals, elasticity is associated with phonons, quantized sound-wave excitations. Phonon-like excitations exist…
T. S. Grigera, V. Martin-Mayor, G. Parisi et al.Jan 8, 2003
Learn
Is Econophysics a Solid Science?
Econophysics is an approach to quantitative economy using ideas, models, conceptual and computational methods of statistical physics. In recent years many of physical theories like theory of…
Z. Burda, J. Jurkiewicz, M. A. NowakJan 8, 2003
Learn
Wave nucleation rate in excitable systems in the low noise limit
Motivated by recent experiments on intracellular calcium dynamics, we study the general issue of fluctuation-induced nucleation of waves in excitable media. We utilize a stochastic Fitzhugh-Nagumo…
Herve Henry, Herbert LevineJan 8, 2003
Learn
Subharmonics and Aperiodicity in Hysteresis Loops
We show that it is possible to have hysteretic behavior for magnets that does not form simple closed loops in steady state, but must cycle multiple times before returning to its initial state. We…
Joshua M. Deutsch, Onuttom NarayanJan 7, 2003
Learn
Spectroscopy of Dark Soliton States in Bose-Einstein Condensates
Experimental and numerical studies of the velocity field of dark solitons in Bose-Einstein condensates are presented. The formation process after phase imprinting as well as the propagation of the…
K. Bongs, S. Burger, D. Hellweg et al.Jan 7, 2003
Learn
Specific heat of classical disordered elastic systems
We study the thermodynamics of disordered elastic systems, applied to vortex lattices in the Bragg glass phase. Using the replica variational method we compute the specific heat of pinned vortons in…
Gregory Schehr, Thierry Giamarchi, Pierre Le DoussalJan 6, 2003
Learn
Critical Nucleation in Colossal Magnetoresistance
Critical exponents have been obtained for a 3D spin particle system. Clusters are formed and system reaches a critical behavior when fragment size distribution follows a power law, as predicted by…
A. Barrañón, J. A. López, C. Dorso et al.Jan 5, 2003
Learn
Phenomenological Gaussian screening in the nonextensive statistics approach to fully developed turbulence
We propose a simple phenomenological modification, a Gaussian screening, of the probability distribution function which was obtained by Beck to explain experimentally measured distribution from fully…
A. K. Aringazin, M. I. MazhitovJan 4, 2003
Learn
Noise spectroscopy of a single spin with spin polarized STM
We show how the noise in a spin polarized STM tunneling current gives valuable spectroscopic information on the temporal susceptibility of a single magnetic atom residing on a non-magnetic surface.
Z. Nussinov, M. F. Crommie, A. V. BalatskyJan 3, 2003
Learn
Valanju, Walser, Valanju Reply to Pendry-Smith Comment on "Wave Refraction in Negative-Index Media: Always Positive and Inhomogeneous"
VWV's inhomogeneous wave solution to Maxwell equations in NIM are correct. In NIM, the modulations do not propagate along the Poynting vector.
P. M. Valanju, R. M. Walser, A. P. ValanjuJan 3, 2003
Learn
From the Bogoliubov-de Gennes equations for superfluid fermions to the Gross-Pitaevskii equation for condensed bosons
We derive the time-independent Gross-Pitaevskii equation at zero temperature for condensed bosons, which form as bound-fermion pairs when the mutual fermionic attractive interaction is sufficiently…
P. Pieri, G. C. StrinatiJan 3, 2003
Learn
An exploding glass ?
We propose a connection between self-similar, focusing dynamics in nonlinear partial differential equations (PDEs) and macroscopic dynamic features of the glass transition. In particular, we explore…
P. G. Kevrekidis, S. K. Kumar, I. G. KevrekidisJan 3, 2003
Learn
Sequential monte carlo samplers
This paper shows how one can use Sequential Monte Carlo methods to perform what is typically done using Markov chain Monte Carlo methods. This leads to a general class of principled integration and…
Pierre Del Moral, Arnaud DoucetDec 31, 2002
Learn
← PreviousPage 37Next →