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Condensed Matter papers — page 46

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Microscopic theory of network glasses
A molecular theory of the glass transition of network forming liquids is developed using a combination of self-consistent phonon and liquid state approaches. Both the dynamical transition and the…
Randall W. Hall, Peter G. WolynesOct 9, 2002
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A Nonlinear Dynamical Model for Ultrafast Catalytic Transfer of Electrons at Zero Temperature
The complex amplitudes of the electronic wavefunctions on different sites are used as Kramers variables for describing Electron Transfer. The strong coupling of the electronic charge to the many…
S. Aubry, G. KopidakisOct 9, 2002
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Monte Carlo study of the critical temperature for the planar rotator model with nonmagnetic impurities
We performed Monte Carlo simulations to calculate the Berezinskii-Kosterlitz-Thouless (BKT) temperature TBKT for the two-dimensional planar rotator model in the presence of nonmagnetic impurity…
S. A. Leonel, Pablo Zimmermann Coura, A. R. Pereira et al.Oct 9, 2002
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Phase coherence length of a Bose-Einstein condensate
We report on the measurement of the momentum distribution of an elongated Bose-Einstein condensate. A broadening of the distribution with increasing temperature is observed, which is clear evidence…
F. Gerbier, S. Richard, J. H. Thywissen et al.Oct 9, 2002
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Agglomeration of Charged Nanopowders in Suspensions
The aim of this work is to understand agglomeration of charged powders suspended in nonpolar fluids. The concerted influence of electromagnetic, hydrodynamic and van der Waals forces as well as…
J. H. Werth, M. Linsenbuehler, S. M. Dammer et al.Oct 9, 2002
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Five-Loop Critical Temperature Shift in Weakly Interacting Homogeneous Bose-Einstein Condensate
Using variational perturbation theory, we calculate the shift in the critical temperature Tc up to five loops to lowest order in the scattering length a and find Delta Tc/Tc(0) approx…
H. KleinertOct 8, 2002
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Cultural transmission and optimization dynamics
We study the one-dimensional version of Axelrod's model of cultural transmission from the point of view of optimization dynamics. We show the existence of a Lyapunov potential for the dynamics.…
Konstantin Klemm, Victor M. Eguiluz, Raul Toral et al.Oct 8, 2002
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X-ray Dichroism in Noncetrosymmetric crystals
In this paper the authors analyse near-edge absorption of x rays in noncentrosymmetric crystals. The work is motivated by recent observations of x-ray dichroic effects which stems from…
Paolo Carra, Andres Jerez, Ivan MarriOct 8, 2002
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Ab-initio density functional studies of stepped TaC surfaces
We report on density functional total energy calculations of the step formation and interaction energies for vicinal TaC(001) surfaces. Our calculations show that double and triple-height steps are…
V. B. Shenoy, C. V. CiobanuOct 6, 2002
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Elastic properties of 2D colloidal crystals from video microscopy
Elastic constants of two-dimensional (2D) colloidal crystals are determined by measuring strain fluctuations induced by Brownian motion of particles. Paramagnetic colloids confined to an air-water…
K. Zahn, A. Wille, G. Maret et al.Oct 5, 2002
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Orbital currents and cheap vortices in underdoped cuprates
In the past several years, we have developed a theory for the underdoped cuprates in collaboration with X.-G. Wen, based on an SU(2) formulation of the t-J model. In this formulation, the staggered…
Patrick A. LeeOct 4, 2002
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Current-induced spin-wave excitations in a single ferromagnetic layer
A new current induced spin-torque transfer effect has been observed in a single ferromagnetic layer without resorting to multilayers. At a specific current density of one polarity injected from a…
Y. Ji, C. L. ChienOct 4, 2002
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Two-body correlations in N-body boson systems
We formulate a method to study two-body correlations in a system of N identical bosons interacting via central two-body potentials. We use the adiabatic hyperspherical approach and assume a…
O. Sørensen, D. V. Fedorov, A. S. JensenOct 4, 2002
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Incompressible States in Double Quantum Dots
Incompressible (magic) states of vertically coupled quantum dots submitted to strong magnetic fields such that only the lowest Landau level is relevant are studied within an exact diagonalization…
Nuria Barberan, Joan SotoOct 3, 2002
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Thermodynamics of the one-dimensional s=1 XXZ Heisenberg model: analytical results
We apply the results recently derived by Rojas et al. to derive the beta-expansion of the Helmholtz free energy of the spin-1 XXZ Heisenberg model up to 5th order in beta. The analytical expansion…
O. Rojas, E. V. Correa-Silva, W. A. Moura-Melo et al.Oct 2, 2002
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Inhomogeneous vortex matter
We present a generalization of the continuum theory of vortex matter for non-uniform superfluid density. This theory explains the striking regularity of vortex lattices observed in Bose-Einstein…
J. R. Anglin, M. CrescimannoOct 2, 2002
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Neutral-ionic phase transition : a thorough ab-initio study of TTF-CA
The prototype compound for the neutral-ionic phase transition, namely TTF-CA, is theoretically investigated by first-principles density functional theory calculations. The study is based on three…
V. Oison, C. Katan, P. Rabiller et al.Oct 1, 2002
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Zero Sound Attenuation near the Quantum Limit in Normal Liquid 3He close to the Superfluid Transition
The zero sound attenuation of normal liquid 3He has been studied over a range of temperatures from slightly above the superfluid transition temperature, Tc, to approximately 10 mK at the constant…
Brian C. Watson, Naoto Masuhara, Mark W. MeiselOct 1, 2002
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Power-law temporal auto-correlations in day-long records of human physical activity and their alteration with disease
We investigate long-duration time series of human physical activity under three different conditions: healthy individuals in (i) a constant routine protocol and (ii) in regular daily routine, and…
Luis A. Nunes Amaral, Danyel J. Bezerra Soares, Luciano R. da Silva et al.Oct 1, 2002
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Dielectric constant of glasses: first observation of a two-dimensional behavior
The 1kHz real part χ' of the dielectric constant of a structural glass was measured at low temperature T down to 14 mK. Reducing the sample thickness h to 10 nm suppresses the usual minimum…
F. Ladieu, J. Le Cochec, P. Pari et al.Oct 1, 2002
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Nanoscale Phase Separation in Colossal Magnetoresistance Materials: A Lesson for the Cuprates?
A recent vast experimental and theoretical effort in manganites has shown that the colossal magnetoresistance effect can be understood based on the competition of charge-ordered and ferromagnetic…
Elbio Dagotto, Jan Burgy, Adriana MoreoSep 30, 2002
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Disorder-induced noncollinear ferromagnetism in models for (III,Mn)V semiconductors
We study the ground state properties of kinetic-exchange models for (III,Mn)V semiconductors with randomly distributed Mn ions. Our method is embedded in a path integral spin-wave type formalism…
John SchliemannSep 30, 2002
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Interacting Crumpled Manifolds: Exact Results to all Orders of Perturbation Theory
In this letter, we report progress on the field theory of polymerized tethered membranes. For the toy-model of a manifold repelled by a single point, we are able to sum the perturbation expansion in…
Henryk A. Pinnow, Kay Joerg WieseSep 30, 2002
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Solution of the crystallographic phase problem by iterated projections
An algorithm for determining crystal structures from diffraction data is described which does not rely on the usual Fourier-space formulations of atomicity. The new algorithm implements atomicity…
Veit ElserSep 30, 2002
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Strongly Localized State of a Photon at the Intersection of the Phase Slips in 2D Photonic Crystal with Low Contrast of Dielectric Constant
Two-dimensional photonic crystal with a rectangular symmetry and low contrast (< 1) of the dielectric constant is considered. We demonstrate that, despite the absence of a bandgap, strong…
V. M. Apalkov, M. E. RaikhSep 28, 2002
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