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Condensed Matter papers — page 26

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Altruistic Duality in Evolutionary Game Theory
A game-theoretic model of social preference and enlightened self-interest is formulated. Existence of symmetry and duality in the game matrices with altruistic social preference is revealed. The…
Taksu CheonMay 15, 2003
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Statistical theory of the excited strip domain structure
A statistical theory of the strip domain structure excited in a bubble film by an oscillating magnetic field is developed. The theory is based on the consideration of the strip domain structure as a…
E. S. DenisovaMay 15, 2003
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Magnetic relaxation in finite two-dimensional nanoparticle ensembles
We study the slow phase of thermally activated magnetic relaxation in finite two-dimensional ensembles of dipolar interacting ferromagnetic nanoparticles whose easy axes of magnetization are…
S. I. Denisov, T. V. Lyutyy, K. N. TrohidouMay 15, 2003
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Mixtures of Bosonic and Fermionic Atoms in Optical Lattices
We discuss the theory of mixtures of Bosonic and Fermionic atoms in periodic potentials at zero temperature. We derive a general Bose--Fermi Hubbard Hamiltonian in a one--dimensional optical lattice…
Alexander Albus, Fabrizio Illuminati, Jens EisertMay 15, 2003
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Multiplicative Noise in Non-equilibrium Phase Transitions: A tutorial
Stochastic phenomena in which the noise amplitude is proportional to the fluctuating variable itself, usually called multiplicative noise, appear ubiquitously in physics, biology, economy and…
Miguel A. MunozMay 15, 2003
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Ground states and dynamics of multi-component Bose-Einstein condensates
We study numerically the time-independent vector Gross-Pitaevskii equations (VGPEs) for ground states and time-dependent VGPEs with (or without) an external driven field for dynamics describing a…
Weizhu BaoMay 14, 2003
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Stability of the quantized circulation of an attractive Bose-Einstein condensate in a rotating torus
We investigate rotational properties of a system of bosons with attractive interactions confined in a one-dimensional torus. Two kinds of ground states, uniform-density and bright-soliton states, are…
Rina Kanamoto, Hiroki Saito, Masahito UedaMay 14, 2003
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Accuracy of circular polarization as a measure of spin polarization in quantum dot qubits
A quantum dot spin LED provides a test of carrier spin injection into a qubit, as well as a means of analyzing carrier spin injection in general and local spin polarization. The polarization of the…
C. E. Pryor, M. E. FlattéMay 13, 2003
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Dipolar interaction effects in the thermally activated magnetic relaxation of two-dimensional nanoparticle ensembles
The thermally activated magnetic relaxation in two-dimensional ensembles of dipolar interacting nanoparticles with large uniaxial perpendicular anisotropy is studied by a numerical method and within…
S. I. Denisov, T. V. Lyutyy, K. N. TrohidouMay 13, 2003
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Spin Resolution of the Electron-Gas Correlation Energy: Positive same-spin contribution
The negative correlation energy per particle of a uniform electron gas of density parameter rs and spin polarization ζ is well known, but its spin resolution into up-down, up-up, and down-down…
Paola Gori-Giorgi, John P. PerdewMay 12, 2003
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A Consistent Picture of a Collapsing Bose-Einstein Condensate
We present a consistent picture of the recent JILA experiments on the collapse of a Bose-Einstein condensate (BEC) [E. A. Donley, et al., Nature 412, 295 (2001)] based on a generalized…
Masahito Ueda, Hiroki SaitoMay 12, 2003
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Feshbach resonances in a quasi-2D atomic gas
Strongly confining an ultracold atomic gas in one direction to create a quasi-2D system alters the scattering properties of this gas. We investigate the effects of confinement on Feshbach scattering…
M. Wouters, J. Tempere, J. T. DevreeseMay 11, 2003
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End-To-End Distribution Function Function of Stiff Polymers for all Persistence Lengths
We set up recursion relations for calculating all even moments of the end-to-end distance of a Porod-Kratky wormlike chains in D dimensions. From these moments we derive a simple analytic…
B. Hamprecht, H. KleinertMay 11, 2003
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Theory of Melting and the Optical Properties of Gold/DNA Nanocomposites
We describe a simple model for the melting and optical properties of a DNA/gold nanoparticle aggregate. The optical properties at fixed wavelength change dramatically at the melting transition, which…
Sung Yong Park, D. StroudMay 10, 2003
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Non-adiabatic loading of a Bose-Einstein condensate into the ground state of an optical lattice
We present a scheme for rapid loading of a Bose-Einstein condensate into a single Bloch state of a weak optical lattice at a quasi-momentum of q = hbar k. Rabi cycling of a Bose condensate between…
A. S. Mellish, G. Duffy, C. McKenzie et al.May 9, 2003
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Excitations in confined helium
We design models for helium in matrices like aerogel, Vycor or Geltech from a manifestly microscopic point of view. For that purpose, we calculate the dynamic structure function of 4He on Si…
V. Apaja, E. KrotscheckMay 9, 2003
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Microscopic two-fluid theory of rotational constants of the OCS-H2 complex in 4He droplets
We present a microscopic quantum analysis for rotational constants of the OCS-H2 complex in helium droplets using the local two-fluid theory in conjunction with path integral Monte Carlo…
Yongkyung Kwon, K. Birgitta WhaleyMay 9, 2003
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Comment on ``Dynamic behavior of anisotropic non-equilibrium driving lattice gases''
In a recent Letter Albano and Saracco study the dynamic critical behavior of some anisotropic driven lattice gases by Monte Carlo (MC) simulations. In this Comment we point out that the Ansätze they…
Sergio Caracciolo, Andrea Gambassi, Massimiliano Gubinelli et al.May 9, 2003
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Equilibrium phase behavior of polydisperse hard spheres
We calculate the phase behavior of hard spheres with size polydispersity, using accurate free energy expressions for the fluid and solid phases. Cloud and shadow curves, which determine the onset of…
M. Fasolo, P. SollichMay 9, 2003
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SU(N) Evolution of a Frustrated Spin Ladder
Recent studies indicate that the weakly coupled spin-1/2 Heisenberg antiferromagnet with next nearest neighbor frustration supports massive spinons when suitably tuned. The straightforward SU(N)…
M. J. Bhaseen, A. M. TsvelikMay 8, 2003
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Stationary Probability Distribution in Granular Media
We discuss recent developments in the formulation of a Statistical Mechanics approach to non thermal systems, such as granular media. We review a few important numerical results on the assessment of…
Antonio Coniglio, Annalisa Fierro, Mario NicodemiMay 8, 2003
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Geminal wavefunctions with Jastrow correlation: a first application to atoms
We introduce a simple generalization of the well known geminal wavefunction already applied in Quantum Chemistry to atoms and small molecules. The main feature of the proposed wavefunction is the…
Michele Casula, Sandro SorellaMay 8, 2003
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New Pseudo-Phase Structure for α-Pu
In this paper we propose a new pseudo-phase crystal structure, based on an orthorhombic distortion of the diamond structure, for the ground-state α-phase of plutonium. Electronic-structure…
J. Bouchet, R. C. Albers, M. D. Jones et al.May 7, 2003
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Anticipated synchronization: a metaphorical linear view
We study the regime of anticipated synchronization recently described on a number of dynamical systems including chaotic and noisy ones. We use simple linear caricatures to show the minimal setups…
Oscar Calvo, Dante R. Chialvo, Victor M. Eguiluz et al.May 6, 2003
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Ferrimagnetism and compensation points in a decorated 3D Ising models
We give a precise numerical solution for decorated Ising models on the simple cubic lattice which show ferromagnetism, compensation points, and reentrant behaviour. The models, consisting of…
J. Oitmaa, W. ZhengMay 6, 2003
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