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Condensed Matter papers — page 130

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The dynamical structure factor in disordered systems
We study the spectral width as a function of the external momentum for the dynamical structure factor of a disordered harmonic solid, considered as a toy model for supercooled liquids and glasses.…
V. Martín-Mayor, G. Parisi, P. VerrocchioNov 29, 1999
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Cooper problem in the vicinity of Anderson transition
We study numerically the ground state properties of the Cooper problem in the three-dimensional Anderson model. It is shown that attractive interaction creates localized pairs in the metallic…
J. Lages, D. L. ShepelyanskyNov 29, 1999
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S-wave Scattering Length from Effective Positronium-Positronium Interaction for Bose-Einstein Condensates
The s-wave scattering length for the Positronium-Positronium interaction is estimated semi-phenomenologically with the long-range van der Waals force and the short-range repulsive potential that…
K. Oda, T. Miyakawa, H. Yabu et al.Nov 29, 1999
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Orbital Ordering in the Manganites :- Resonant X-ray Scattering Predictions at the Manganese LII and LIII Edges
It is proposed that the observation of orbital ordering in manganite materials should be possible at the LII and LIII edges of manganese using X-ray resonant scattering. If performed, dipole…
C. W. M. Castleton, M. AltarelliNov 26, 1999
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New Evidence of Earthquake Precursory Phenomena in the 17 Jan. 1995 Kobe Earthquake, Japan
Significant advances, both in the theoretical understanding of rupture processes in heterogeneous media and in the methodology for characterizing critical behavior, allows us to reanalyze the…
A. Johansen, H. Saleur, D. SornetteNov 26, 1999
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Critical Effects at 3D Wedge-Wetting
We show that continuous filling or wedge-wetting transitions are possible in 3D wedge-geometries made from (angled) substrates exhibiting first-order wetting transitions and develop a comprehensive…
A. O. Parry, C. Rascon, A. J. WoodNov 26, 1999
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The Values Distribution in a Competing Shares Financial Market Model
We present our competing shares financial market model and describe its behaviour by numerical simulation. We show that in the critical region the distribution avalanches of the market value as…
A. Ponzi, Y. AizawaNov 26, 1999
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Artifactual log-periodicity in finite size data: Relevance for earthquake aftershocks
The recently proposed discrete scale invariance and its associated log-periodicity are an elaboration of the concept of scale invariance in which the system is scale invariant only under powers of…
Y. Huang, A. Johansen, M. W. Lee et al.Nov 25, 1999
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BEC and the New World of Coherent Matter Waves
This paper is based on three tutorial lectures given at the CRM Summer School in Banff, Alberta, June 27-July 10, 1999 on "Theoretical Physics at the End of the Twentieth Century". They will…
Allan GriffinNov 25, 1999
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The non-extensive version of the Kolmogorov-Sinai entropy at work
We address the problem of applying the Kolmogorov-Sinai method of entropic analysis, expressed in a generalized non-extensive form, to the dynamics of the logistic map at the chaotic threshold, which…
S. Montangero, L. Fronzoni, P. GrigoliniNov 25, 1999
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Influence of shear stress σ6 on the phase transition and physical properties of KD2PO4 type ferroelectrics
Within the four-particle cluster approximation for the proton ordering model we study the influence of shear stress σ6 on the phase transition, static dielectric, elastic and thermal properties of…
I. V. Stasyuk, R. R. Levitskii, I. R. Zachek et al.Nov 25, 1999
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Density-Matrix approach to a Strongly Coupled Two-Component Bose-Einstein Condensate
The time evolution equations for average values of population and relative phase of a strongly coupled two component BEC is derived analytically. The two components are two hyper-fine states coupled…
Andal Narayanan, Hema RamachandranNov 24, 1999
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Magnetization plateaux in dimerized spin ladder arrays
We investigate the ground state magnetization plateaux appearing in spin 1/2 two-leg ladders built up from dimerized antiferromagnetic Heisenberg chains and dimerized zig-zag interchain couplings.…
D. C. Cabra, M. D. GrynbergNov 24, 1999
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Generalized Boltzmann equation for a trapped Bose-condensed gas using the Kadanoff-Baym formalism
Using the Kadanoff-Baym non-equilibrium Green's function formalism, we derive kinetic equations for the non-condensate atoms at finite temperatures which include the effect of binary collisions…
Milena Imamovic-Tomasovic, Allan GriffinNov 24, 1999
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Charge ordering and long-range interactions in layered transition metal oxides: a quasiclassical continuum study
The competition between long-range and short-range interactions among holes moving in an antiferromagnet (AF), is studied within a model derived from the spin density wave picture of layered…
Branko P. Stojkovic, Z. G. Yu, A. L. Chernyshev et al.Nov 23, 1999
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Collisionless dynamics of dilute Bose gases: Role of quantum and thermal fluctuations
We study the low-energy collective oscillations of a dilute Bose gas at finite temperature in the collisionless regime. By using a time-dependent mean-field scheme we derive for the dynamics of the…
S. GiorginiNov 23, 1999
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Monopole, half-quantum vortices and nexus in chiral superfluids and superconductors
Two exotic objects are still not identified experimentally in chiral superfluids and superconductors. These are the half-quantum vortex, which plays the part of the Alice string in relativistic…
G. E. VolovikNov 23, 1999
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Stimulated Bremsstrahlung in ElectronNucleus Scattering in a Multifrequency Electromagnetic Field
We theoretically investigate stimulated bremsstrahlung emission and absorption (SBEA) in the scattering of a relativistic electron by a nucleus in a multifrequency field of circularly polarized plane…
S. P. Roshchupkin, A. I. VoroshiloNov 23, 1999
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Phase transition in the transverse Ising model using the extended coupled-cluster method
The phase transition present in the linear-chain and square-lattice cases of the transverse Ising model is examined. The extended coupled cluster method (ECCM) can describe both sides of the phase…
J. Rosenfeld, N. E. LigterinkNov 23, 1999
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New Spin-Wave Mode in Weak Ferromagnetic Fermi Liquids
We study a phenomenological model for weak ferromagnetic Fermi liquids and investigate the properties of the spin waves in the model. The Landau kinetic equation is used to derive, in addition to the…
Penka I. PetkovaNov 23, 1999
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Treating some solid state problems with the Dirac equation
The ambiguity involved in the definition of effective-mass Hamiltonians for nonrelativistic models is resolved using the Dirac equation. The multistep approximation is extended for relativistic cases…
R. Renan, M. H. Pacheco, C. A. S. AlmeidaNov 22, 1999
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Characterization of localized hole states in Pr(1+x)Ba(2-x)Cu(3)O(6+y) by nuclear magnetic resonance
We investigated the charge distribution in Pr1+xBa2-xCu3O6+y-crystals at liquid-He temperature by means of 63,65Cu- and 141Pr-NMR and NQR. The electric field gradients determined for…
M. W. Pieper, F. Wiekhorst, T. WolfNov 22, 1999
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Wetting at Non-Planar and Heterogeneous Substrates
We report results of wetting on non-planar and heterogeneous surfaces calculated from an effective interfacial Hamiltonian model. The lack of translational invariance along the substrate induces a…
C Rascon, AO ParryNov 22, 1999
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Comments on "New representations of the Hecke algebra and algebraic Bethe Ansatz for an integrable generalized spin ladder", by H.-Q. Zhou, H. Frahm and M.D. Gould, cond-mat/9911072
The authors of cond-mat/9911072 claim to introduce "new representations of the Hecke algebra." These representations are shown to be the XXC models introduced two years ago in…
Z. MaassaraniNov 22, 1999
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The energy-level statistics in the core of a vortex in a p-wave superconductor
In the presence of strong disorder, the statistics of quasiparticle levels in the core of a vortex in a two-dimensional p-wave superconductor belongs to the universality class B corresponding to the…
D. A. IvanovNov 22, 1999
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