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Condensed Matter papers — page 41

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Thermodynamics of tin clusters
We report the results of detailed thermodynamic investigations of the Sn20 cluster using density-functional molecular dynamics. These simulations have been performed over a temperature range of…
Kavita Joshi, D. G. Kanhere, S. A. BlundellNov 24, 2002
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Kinetic Theory for Economies
Can we possibly build economic systems using kinetic-like theories?
Wan Ahmad Tajuddin Wan AbdullahNov 23, 2002
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Ab initio many-body calculations of static dipole polarizabilities of linear carbon chains and chain-like boron clusters
In this paper we report a theoretical study of the static dipole polarizability of two one-dimensional structures: (a) linear carbon chains Cn (n=2-10) and (b) ladder-like planar boron chains…
Ayjamal Abdurahman, Alok Shukla, Gotthard SeifertNov 23, 2002
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Two-site two-electron Holstein model: a perturbation study
The two-site two-electron Holstein model is studied within a perturbation method based on a variational phonon basis obtained through the modified Lang-Firsov (MLF) transformation. The ground-state…
Jayita Chatterjee, A. N. DasNov 22, 2002
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Probing the classical field approximation - thermodynamics and decaying vortices
We review our version of the classical field approximation to the dynamics of a finite temperature Bose gas. In the case of a periodic box potential, we investigate the role of the high momentum…
H. Schmidt, K. Goral, F. Floegel et al.Nov 22, 2002
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Perturbative expansion using variational phonon basis for Holstein model
A simple variational displacement phonon basis, obtained through the modified Lang-Firsov (MLF) transformation, is proposed to study the Holstein model.This phonon basis contains only one variational…
Jayita Chatterjee, A. N. Das, P. ChoudhuryNov 22, 2002
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A Modified Random Phase Approximation of Polyelectrolyte Solutions
We compute the phase diagram of salt-free polyelectrolyte solutions using a modified Debye-Huckel Approach. We introduce the chain connectivity via the Random Phase Approximation with two important…
A. V. Ermoshkin, M. Olvera de la CruzNov 21, 2002
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Structure and thermodynamics of associating rods solutions
Thermoreversible sol-gel transitions in solutions of rod-like associating polymers are analyzed by computer simulations and by mean field models. The sol-gel transition is determined by the…
Min Sun Yeom, Alexander V. Ermoshkin, Monica Olvera de la CruzNov 21, 2002
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Polyelectrolytes in the presence of multivalent ions: gelation versus segregation
We analyze solutions of strongly charged chains bridged by linkers such as multivalent ions. The gelation induced by the strong short range electrostatic attractions is dramatically suppressed by the…
A. V. Ermoshkin, M. Olvera de la CruzNov 21, 2002
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Portfolio Selection with Probabilistic Utility, Bayesian Statistics and Markov Chain Monte Carlo
We propose a novel portfolio selection approach that manages to ease some of the problems that characterise standard expected utility maximisation. The optimal portfolio is no longer defined as the…
P. Rossi, M. Tavoni, F. Cocco et al.Nov 21, 2002
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Slow rotation of a superfluid trapped Fermi gas
The moment of inertia, Theta, is one of the possible observables for the experimental determination whether a trapped Fermi system has reached the BCS transition or not. In this article we…
Michael Urban, Peter SchuckNov 21, 2002
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Theoretical analysis of the focusing of acoustic waves by two-dimensional sonic crystals
Motivated by a recent experiment on acoustic lenses, we perform numerical calculations based on a multiple scattering technique to investigate the focusing of acoustic waves with sonic crystals…
Bikash C. Gupta, Zhen YeNov 21, 2002
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Parametric quantum spin pump
We investigate a non-adiabatic parametric quantum pump consists of a nonmagnetic scattering region connected by two ferromagnetic leads. The presence of ferromagnetic leads allows electrons with…
Wei Zheng, Junling Wu, Baigeng Wang et al.Nov 21, 2002
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Coarse Brownian Dynamics for Nematic Liquid Crystals: Bifurcation Diagrams via Stochastic Simulation
We demonstrate how time-integration of stochastic differential equations (i.e. Brownian dynamics simulations) can be combined with continuum numerical bifurcation analysis techniques to analyze the…
C. I. Siettos, M. D. Graham, I. G. KevrekidisNov 20, 2002
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Solutions of the Gross-Pitaevskii equation in two dimensions
In two dimensions the Gross-Pitaevskii equation for a cold, dilute gas of bosons has an energy dependent coupling parameter describing particle interactions. We present numerical solutions of this…
M. D. Lee, S. A. MorganNov 20, 2002
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Energy dependent scattering and the Gross-Pitaevskii Equation in two dimensional Bose-Einstein condensates
We consider many-body effects on particle scattering in one, two and three dimensional Bose gases. We show that at zero temperature these effects can be modelled by the simpler two-body T-matrix…
M. D. Lee, S. A. Morgan, M. J. Davis et al.Nov 20, 2002
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Nonlinear Coherent Modes of Trapped Bose-Einstein Condensates
Nonlinear coherent modes are the collective states of trapped Bose atoms, corresponding to different energy levels. These modes can be created starting from the ground state condensate that can be…
V. I. Yukalov, E. P. Yukalova, V. S. BagnatoNov 20, 2002
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Vortex dynamics in the nonlinear Schrodinger equation
The dynamics of a two-dimensional vortex are analyzed within the framework of the nonlinear Schrodinger equation. Both a bare vortex and a vortex with an external mass trapped in a finite-sized core…
Michael J. QuistNov 20, 2002
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Functionals linear in curvature and statistics of helical proteins
The effective free energy of globular protein chain is considered to be a functional defined on smooth curves in three dimensional Euclidean space. From the requirement of geometrical invariance,…
A. Feoli, V. V. Nesterenko, G. ScarpettaNov 19, 2002
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Vortex nucleation in Bose-Einstein condensates in time-dependent traps
Vortex nucleation in a Bose-Einstein condensate subject to a stirring potential is studied numerically using the zero-temperature, two-dimensional Gross-Pitaevskii equation. It is found that this…
Emil Lundh, J. -P. Martikainen, Kalle-Antti SuominenNov 19, 2002
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Nonlinear dynamics for vortex lattice formation in a rotating Bose-Einstein condensate
We study the response of a trapped Bose-Einstein condensate to a sudden turn-on of a rotating drive by solving the two-dimensional Gross-Pitaevskii equation. A weakly anisotropic rotating potential…
Kenichi Kasamatsu, Makoto Tsubota, Masahito UedaNov 19, 2002
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Thermodynamics of an interacting trapped Bose-Einstein gas in the classical field approximation
We present a convenient technique describing the condensate in dynamical equilibrium with the thermal cloud, at temperatures close to the critical one. We show that the whole isolated system may be…
K. Goral, M. Gajda, K. RzazewskiNov 19, 2002
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Physical Validity of Assumptions for Public Exposure to Mobile Phones
KEYWORDS: free energy, boundary condition, non-thermal interaction, mobile phone, public safety, precautional principle, security hole
Tsuyoshi HondouNov 18, 2002
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Organization of atomic bond tensions in model glasses
In order to understand whether internal stresses in glasses are correlated or randomly distributed, we study the organization of atomic bond tensions (normal forces between pairs of atoms).…
T. Kustanovich, Y. Rabin, Z. OlamiNov 18, 2002
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Many-Body Vacuum Diagrams and Their Recursive Graphical Construction
The grand-canonical potential of many-body physics can be considered as a functional of the interaction-free correlation function. As such it obeys a nonlinear functional differential equation which…
Axel Pelster, Konstantin GlaumNov 18, 2002
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