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Condensed Matter papers — page 134

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The Debye-Waller Factor in solid 3He and 4He
The Debye-Waller factor and the mean-squared displacement from lattice sites for solid 3He and 4He were calculated with Path Integral Monte Carlo at temperatures between 5 K and 35 K, and densities…
E. W. Draeger, D. M. CeperleyOct 20, 1999
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Magnetic strip waveguides
We analyze the spectrum of the "local" Iwatsuka model, i.e. a two-dimensional charged particle interacting with a magnetic field which is homogeneous outside a finite strip and…
Pavel Exner, Hynek KovarikOct 20, 1999
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Renormalized Theory of Infinitely Driven Lattice Gases
We use field theoretic renormalization group methods to study the critical behavior of a recently proposed Langevin equation for driven lattice gases under infinitely fast drive. We perform an…
F. de los Santos, Miguel A. MuñozOct 20, 1999
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A scaling theory of 3D spinodal turbulence
A new scaling theory for spinodal decomposition in the inertial hydrodynamic regime is presented. The scaling involves three relevant length scales, the domain size, the Taylor microscale and the…
V M KendonOct 19, 1999
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Zener transitions between dissipative Bloch bands. II: Current Response at Finite Temperature
We extend, to include the effects of finite temperature, our earlier study of the interband dynamics of electrons with Markoffian dephasing under the influence of uniform static electric fields. We…
Xian-Geng Zhao, Daniel W. HoneOct 19, 1999
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A Generalized Ginzburg-Landau Approach to Second Harmonic Generation
We develop a generalized Ginzburg-Landau theory for second harmonic generation (SHG) in magnets by expanding the free energy in terms of the order parameter in the magnetic phase and the…
Debanand Sa, R. Valenti, C. GrosOct 19, 1999
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Signatures of an intermediate 2d Coulomb phase at low temperatures
The study of the ground state of spinless fermions in 2d disordered clusters (Phys. Rev. Lett. 83, 1826 (1999)) has suggested the existence of a new quantum phase for intermediate Coulomb…
Giuliano Benenti, Xavier Waintal, Jean-Louis PichardOct 18, 1999
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Universal Selftrapping in Nonlinear Tight-binding Lattices
We show that nonlinear tight-binding lattices of different geometries and dimensionalities, display an universal selftrapping behavior. First, we consider the single nonlinear impurity problem in…
C. A. Bustamante, M. I. MolinaOct 18, 1999
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Spectral Representation for the Effective Macroscopic Response of a Polycrystal: Application to Third-Order Nonlinear Susceptibility
Erratum: In our paper, we show that the spectral representation for isotropic two-component composites also applies to uniaxial polycrystals. We have learned that this result was, in fact, first…
S. Barabash, D. StroudOct 15, 1999
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Hydrodynamic Approach to Vortex Lifetime in Trapped Bose Condensates
We study a vortex in a two-dimensional, harmonically trapped Bose-Einstein condensate at zero temperature. Through a variational calculation using a trial condensate wave function and a nonlinear…
Emil Lundh, P. AoOct 15, 1999
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Magnetic field induced directional localization in a 2D rectangular lattice
We study the effect of a perpendicular uniform magnetic field on the dissipative conductivity of a rectangular lattice with anisotropic hopping, tx≠ ty . We show that the magnetic field may…
Armelle Barelli, Jean Bellissard, Francisco ClaroOct 14, 1999
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Driven Tunneling: Chaos and Decoherence
Chaotic tunneling in a driven double-well system is investigated in absence as well as in the presence of dissipation. As the constitutive mechanism of chaos-assisted tunneling, we focus on the…
Peter Hanggi, Sigmund Kohler, Thomas DittrichOct 13, 1999
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Doping dependence of the Neel temperature in Mott-Hubbard antiferromagnets: Effect of vortices
The rapid destruction of long-range antiferromagnetic order upon doping of Mott-Hubbard antiferromagnetic insulators is studied within a generalized Berezinskii-Kosterlitz-Thouless renormalization…
Carsten Timm, K. H. BennemannOct 13, 1999
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Coupled-mode theory for Bose-Einstein condensates
We apply the concepts of nonlinear guided-wave optics to a Bose-Einstein condensate (BEC) trapped in an external potential. As an example, we consider a parabolic double-well potential and derive…
Elena A. Ostrovskaya, Yuri S. Kivshar, Mietek Lisak et al.Oct 13, 1999
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Designing emissive conjugated polymers with small optical gaps: a step towards organic polymeric infrared lasers
We show that chemical modification of the trans-polyacetylene structure that involves substitution of the backbone hydrogen atoms with conjugated side groups, leads to reduction of the backbone bond…
Alok Shukla, Sumit MazumdarOct 13, 1999
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Dynamical Transverse Meissner Effect and Transition in Moving Bose Glass
We study moving periodic structures in presence of correlated disorder using renormalisation group. We find that the effect of disorder persists at all velocities resulting at zero temperature in a…
Pascal Chauve, Pierre Le Doussal, Thierry GiamarchiOct 13, 1999
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On modulational instability and energy localization in anharmonic lattices at finite energy density
The localization of vibrational energy, induced by the modulational instability of the Brillouin-zone-boundary mode in a chain of classical anharmonic oscillators with finite initial energy density,…
Yuriy A. Kosevich, Stefano LepriOct 13, 1999
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Superconductivity and Topological Numbers in the Hubbard Chain with Bond-Charge Interaction
We determine the quantum phase diagram of the Hubbard chain with electron-hole symmetric correlated hopping at 1/2- and 1/4-filling using geometric concepts and continuum limit field theory. The long…
A. A. Aligia, K. Hallberg, C. D. Batista et al.Oct 12, 1999
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Hysteresis in One-Dimensional Anti-Ferromagnetic Random-Field Ising Model at Zero-Temperature
We analyse hysteresis in a one-dimensional anti-ferromagnetic random field Ising model at zero-temperature. The random field is taken to have a rectangular distribution of width 2 Δ centered about…
Prabodh Shukla, Ratnadeep Roy, Emilia RayOct 12, 1999
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The Free Energy Formula
The Onsager formula for the free energy of the two dimensional Ising model with periodic boundary conditions is proved.
Yu. M. ZinovievOct 12, 1999
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Optimal Fluctuations and Tail States of non-Hermitian Operators
We develop a general variational approach to study the statistical properties of the tail states of a wide class of non-Hermitian operators. The utility of the method, which is a refinement of the…
A. V. Izyumov, B. D. SimonsOct 11, 1999
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Collective oscillations driven by correlation in the nonlinear optical regime
We present an analytical and numerical study of the coherent exciton polarization including exciton-exciton correlation. The time evolution after excitation with ultrashort optical pulses can be…
Th. Oestreich, L. J. ShamOct 11, 1999
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First principles study of Li intercalated carbon nanotube ropes
We studied Li intercalated carbon nanotube ropes by using first principles methods. Our results show charge transfer between Li and C and small structural deformation of nanotube due to…
Jijun Zhao, Alper Buldum, Jie Han et al.Oct 9, 1999
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Interface dynamics in Hele-Shaw flows with centrifugal forces. Preventing cusp singularities with rotation
A class of exact solutions of Hele-Shaw flows without surface tension in a rotating cell is reported. We show that the interplay between injection and rotation modifies drastically the scenario of…
F. X. Magdaleno, A. Rocco, J. CasademuntOct 8, 1999
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On the relation between the anyon and Calogero models
In order to achieve a dimensional reduction from dimension two to one not only in phase space but also in configuration space, the lowest Landau level (LLL) projection is not sufficient. One has…
Stéphane OuvryOct 8, 1999
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