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Condensed Matter papers — page 43

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Symmetry breaking and defects
Symmetry-breaking phase transitions are ubiquitous in condensed matter systems and in quantum field theories. There is also good reason to believe that they feature in the very early history of the…
T. W. B. KibbleNov 6, 2002
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Role of bulk and of interface contacts in the behaviour of model dimeric proteins
Some dimeric proteins first fold and then dimerize (three--state dimers) while others first dimerize and then fold (two--state dimers). Within the framework of a minimal lattice model, we can…
G. Tiana, D. Provasi, R. A. BrogliaNov 6, 2002
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Spectrum of Coherent Modes for Trapped Bose Gas
The spectrum of coherent modes for dilute atomic Bose gas, confined in a cylindrical trap, is calculated by applying optimized perturbation theory and the technique of self-similar root approximants.…
V. I. Yukalov, E. P. Yukalova, V. S. BagnatoNov 6, 2002
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Unstable particles versus resonances in impurity systems, conductance in quantum wires
We compute the DC conductance for a homogeneous sine-Gordon model and an impurity system of Luttinger liquid type by means of the thermodynamic Bethe ansatz and standard potential scattering theory.…
O. A. Castro-Alvaredo, A. FringNov 6, 2002
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Momentum distribution and correlation function of quasicondensates in elongated traps
We calculate the spatial correlation function and momentum distribution of a phase-fluctuating, elongated three-dimensional condensate, in a trap and in free expansion. We take the inhomogeneous…
F. Gerbier, J. H. Thywissen, S. Richard et al.Nov 5, 2002
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Giffen paradoxes in quantum market games
Recent development in quantum computation and quantum information theory allows to extend the scope of game theory for the quantum world. The paper presents the history and basic ideas of quantum…
J. SladkowskiNov 5, 2002
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A consistent Lie algebraic representation of quantum phase and number operators
A consistent realization of the quantum operators corresponding to the canonically conjugate phase and number variables is proposed, resorting to the irreducible unitary representations of the Lie…
Mario RasettiNov 5, 2002
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Ground-state properties of trapped Bose-Fermi mixtures: role of exchange-correlation
We introduce Density Functional Theory for inhomogeneous Bose-Fermi mixtures, derive the associated Kohn-Sham equations, and determine the exchange-correlation energy in local density approximation.…
Alexander P. Albus, Fabrizio Illuminati, Martin WilkensNov 4, 2002
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Matrix Order Indices in Statistical Mechanics
A new notion is introduced of matrix order indices which relate the matrix norm and its trace. These indices can be defined for any given matrix. They are especially important for matrices describing…
V. I. YukalovNov 4, 2002
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Transport properties of 1D disordered models: a novel approach
A new method is developed for the study of transport properties of 1D models with random potentials. It is based on an exact transformation that reduces discrete Schrödinger equation in the…
V. Dossetti-Romero, F. M. Izrailev, A. A. KrokhinNov 1, 2002
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Waves and energy in chiral nihility
A model for a chiral material in which both the permittivity and permeability are equal to zero is discussed. Such a material is referred by us as a ``chiral nihility". It is shown that this…
Sergei Tretyakov, Igor Nefedov, Ari Sihvola et al.Nov 1, 2002
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Molecular dynamics simulations of crystallization of hard spheres
We have carried out molecular dynamics simulations of the crystallization of hard spheres modelling colloidal systems that are studied in conventional and space-based experiments. We use microscopic…
Igor Volkov, Marek Cieplak, Joel Koplik et al.Nov 1, 2002
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Autotools for writing portable software
Most of the scientific software is developed in the same manner: It starts at a lab and the scientist says "This part of software is only for my private use". But the software grows and…
Jens KruegerNov 1, 2002
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More statistical properties of order books and price impact
We investigate present some new statistical properties of order books. We analyse data from the Nasdaq and investigate (a) the statistics of incoming limit order prices, (b) the shape of the average…
Marc Potters, Jean-Philippe BouchaudOct 31, 2002
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Dipolar corrections to the static magnetic susceptibility of condensed 3He
We examine the consequences of a recent model describing correlated zero-point polarization of the electronic cloud in solid 3He. This polarization arises from the highly anisotropic and…
Nir GovOct 31, 2002
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Superradiant Operation of Spin Masers
The theory of spin superradiance, developed earlier for nuclear magnets, is generalized to a wider class of spin systems, such as granular magnets and molecular magnets. The latter may possess strong…
V. I. YukalovOct 31, 2002
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Emergence of heterogeneity in an agent-based model
We study an interacting agent model of a game-theoretical economy. The agents play a minority-subsequently-majority game and they learn, using backpropagation networks, to obtain higher payoffs. We…
Wan Ahmad Tajuddin Wan AbdullahOct 31, 2002
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Expansion of a dipolar condensate
We discuss the expansion of an initially trapped dipolar condensate. When the nominal isotropic s-wave interaction strength becomes tunable through a Feshbach resonance, anisotropic dipolar effects…
S. Yi, L. YouOct 30, 2002
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Polarized x-ray absorption spectra of CuGeO3 at the Cu and Ge K edges
Polarized x-ray absorption near edge structure (XANES) spectra at both the Cu and the Ge K-edges of CuGeO3 are measured and calculated relying on the real-space multiple-scattering formalism within a…
Ondrej Sipr, Antonin Simunek, Sergey Bocharov et al.Oct 30, 2002
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Fission of multielectron bubbles in liquid helium
The stability of multielectron bubbles (MEBs) in liquid helium is investigated using the liquid-drop model for fissioning nuclei. Whereas a critical positive pressure can make the bubble unstable…
J. Tempere, I. F. Silvera, J. T. DevreeseOct 30, 2002
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Learning strategies for global games with delayed payoffs
Economic ensembles can be modeled as networks of interacting agents whose be-haviors are described in terms of game theory. The evolutionary paradigm has been applied to two-person games to discover…
Wan Ahmad Tajuddin Wan AbdullahOct 30, 2002
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A closer look at the hysteresis loop for ferromagnets - A survey of misconceptions and misinterpretations in textbooks
This article describes various misconceptions and misinterpretations concerning presentation of the hysteresis loop for ferromagnets occurring in undergraduate textbooks. These problems originate…
H. W. F. Sung, C. RudowiczOct 30, 2002
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Short-Distance Correlation Properties of the Lieb-Liniger System and Momentum Distributions of Trapped One-Dimensional Atomic Gases
We derive exact closed form expressions for the first few terms of the short-distance Taylor expansion of the one-body correlation function of the Lieb-Liniger gas. As an intermediate result we…
Maxim Olshanii, Vanja DunjkoOct 29, 2002
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Bose-Einstein condensates with attractive interactions on a ring
Considering an effectively attractive quasi-one-dimensional Bose-Einstein condensate of atoms confined in a toroidal trap, we find that the system undergoes a phase transition from a uniform to a…
G. M. KavoulakisOct 29, 2002
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Some puzzling problems in nonequilibrium field theories
I review some open problems on the ever-growing field of non-equilibrium phase transitions, paying special attention to the formulation of such problems in terms of Langevin equations or,…
Miguel A. MunozOct 29, 2002
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