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Condensed Matter papers — page 34

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Phase transition and landscape statistics of the number partitioning problem
The phase transition in the number partitioning problem (NPP), i.e., the transition from a region in the space of control parameters in which almost all instances have many solutions to a region in…
Peter F. Stadler, Wim Hordijk, José F. FontanariFeb 7, 2003
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Local induction approximation in the theory of superfluid turbulence
The local induction approximation (LIA) of the Biot-Savart law is often used for numerical and analytical investigations of vortex dynamics (in particular in the theory of superfluid turbulence). In…
M. V. NedoboikoFeb 7, 2003
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Comment on recent claims by Sornette and Zhou
Comment on recent claims by Sornette and Zhou: D. Sornette and W. Zhou, Quantitative Finance 2 (6), 468-481 (2002); Evidence of a Worldwide Stock Market Log-Periodic Anti-Bubble Since Mid-2000,…
Anders JohansenFeb 7, 2003
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Molecular Orbital Theory of the gaseous Bose-Einstein condensate: Natural Orbital analysis of strongly correlated ground and excited states of an atomic condensate in a double well
The possibility, envisaged in 1925 by Einstein following the suggestion of Bose, of a dilute gas of atoms being condensed into a single quantum state was experimentally achieved in 1995 following…
William P. Reinhardt, Heidi PerryFeb 6, 2003
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Weak ferromagnetism with very large canting in a chiral lattice: (pyrimidine)2FeCl2
The transition metal coordination compound (pyrimidine)2FeCl2 crystallizes in a chiral lattice, space group I 41 2 2 (or I43 2 2). Combined magnetization, Mossbauer spectroscopy and powder neutron…
R. Feyerherm, A. Loose, T. Ishida et al.Feb 6, 2003
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Hydrodynamic excitations of trapped dipolar fermions
A single-component Fermi gas of polarized dipolar particles in a harmonic trap can undergo a mechanical collapse due to the attractive part of the dipole-dipole interaction. This phenomenon can be…
K. Goral, M. Brewczyk, K. RzazewskiFeb 6, 2003
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Distribution and density of the partition function zeros for the diamond-decorated Ising model
Exact renormalization map of temperature between two successive decorated lattices is given, and the distribution of the partition function zeros in the complex temperature plane is obtained for any…
Yen-Liang Chou, Ming-Chang HuangFeb 5, 2003
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The nature of Feshbach molecules in Bose-Einstein condensates
We discuss the long range nature of the molecules produced in recent experiments on molecular Bose-Einstein condensation. The properties of these molecules depend on the full two-body Hamiltonian and…
Thorsten Koehler, Thomas Gasenzer, Paul Julienne et al.Feb 4, 2003
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Weakly Non-ideal Bose Gas: Comments on Critical Temperature Calculations
A number of calculations have appeared for the Bose-Einstein condensation temperature (Tc) of a weakly repulsive dilute Bose gas. After a short survey of previous work, I point out several issues…
Masudul HaqueFeb 4, 2003
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On orientational relief of inter-molecular potential and the structure of domain walls in fullerite C60
A simple planar model for an orientational ordering of threefold molecules on a triangular lattice modelling a close-packed (111) plane of fullerite is considered. The system has 3-sublattice ordered…
Julia M. Khalack, Vadim M. LoktevFeb 4, 2003
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Crowd-Anticrowd Theory of Multi-Agent Minority Games
We present a formal treatment of the Crowd-Anticrowd theory of Minority Games played by a population of competing agents. This theory is built around a description of the crowding which arises within…
Michael L. Hart, Neil F. JohnsonFeb 4, 2003
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Slave modes in systems with many absorbing states
Paper Withdrawn. Some aspects of the RG calculation have to be reconsidered. It will be rewritten.
Miguel A. Munoz, C. A. da Silva Santos, M. A. SantosFeb 4, 2003
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Non Fermi Liquid behavior in the under-screened Kondo model
Using the Schwinger boson spin representation, we reveal a new aspect to the physics of a partially screened magnetic moment in a metal, as described by the spin S Kondo model. We show that the…
P. Coleman, C. PepinFeb 3, 2003
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Topology, connectivity and electronic structure of C and B cages and the corresponding nanotubes
After a brief discussion of the structural trends which appear with increasing number of atoms in B cages, a one-to one correspondence between the connectivity of B cages and C cage structures will…
F. E. Leys, C. Amovilli, N. H. MarchFeb 3, 2003
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Entropy Analysis of Stochastic Processes at Finite Resolution
The time evolution of complex systems usually can be described through stochastic processes. These processes are measured at finite resolution, what necessarily reduces them to finite sequences of…
D. M. Tavares, L. S. LucenaFeb 3, 2003
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On the space-time curvature experienced by quasiparticle excitations in the Painleve-Gullstrand effective geometry
We consider quasiparticle propagation in constant-speed-of-sound (iso-tachic) and almost incompressible (iso-pycnal) hydrodynamic flows, using the technical machinery of general relativity to…
Uwe R. Fischer, Matt VisserFeb 3, 2003
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Quasiperiodic functions theory and the superlattice potentials for a two-dimensional electron gas
We consider Novikov problem of the classification of level curves of quasiperiodic functions on the plane and its connection with the conductivity of two-dimensional electron gas in the presence of…
Andrei Ya. MaltsevFeb 2, 2003
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Vortex Deconfinement in the XY Model with a Magnetic Field
We study vortex unbinding for the classical two-dimensional XY model in a magnetic field on square and triangular lattices. A renormalization group analysis combined with duality in the model shows…
H. A. Fertig, Kingshuk MajumdarFeb 1, 2003
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Connectivity strategies to enhance the capacity of weight-bearing networks
The connectivity properties of a weight-bearing network are exploited to enhance it's capacity. We study a 2-d network of sites where the weight-bearing capacity of a given site depends on the…
T. M. Janaki, Neelima GupteFeb 1, 2003
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Evolutionary Stability of Ecological Hierarchy
A self-similar hierarchical solution that is both dynamically and evolutionarily stable is found to the multi dimensional Lotka-Volterra equation with a single chain of prey-predator relations. This…
Taksu CheonJan 31, 2003
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Delocalizing effect of the Hubbard repulsion for electrons on a two-dimensional disordered lattice
We study numerically the ground-state properties of the repulsive Hubbard model for spin-1/2 electrons on two-dimensional lattices with disordered on-site energies. The projector quantum Monte Carlo…
Bhargavi Srinivasan, Giuliano Benenti, Dima L. ShepelyanskyJan 31, 2003
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Relation between Magnitude Series Correlations and Multifractal Spectrum Width
We study the correlation properties of long-range correlated time series, xi, with tunable correlation exponent and built-in multifractal properties. For the cases we investigate we find that the…
Yosef Ashkenazy, Shlomo Havlin, Plamen Ch. Ivanov et al.Jan 31, 2003
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Cohomology for Anyone
Crystallography has proven a rich source of ideas over several centuries. Among the many ways of looking at space groups, N. David Mermin has pioneered the Fourier-space approach. Recently, we have…
David A. Rabson, John F. Huesman, Benji N. FisherJan 30, 2003
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Arbitrary Choice of Basic Variables in Density Functional Theory. I. Formalism
The Hohenberg-Kohn theorem of the density functional theory is extended by modifying the Levy constrained-search formulation. The new theorem allows us to choose arbitrary physical quantities as the…
M. Higuchi, K. HiguchiJan 30, 2003
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Relaxation and reconstruction on (111) surfaces of Au, Pt, and Cu
We have theoretically studied the stability and reconstruction of (111) surfaces of Au, Pt, and Cu. We have calculated the surface energy, surface stress, interatomic force constants, and other…
Z. Crljen, P. Lazic, D. Sokcevic et al.Jan 30, 2003
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