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Condensed Matter papers — page 49

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Microscopic theory of atom-molecule oscillations in a Bose-Einstein condensate
In a recent experiment at JILA [E.A. Donley et al., Nature (London) 417, 529 (2002)] an initially pure condensate of Rb-85 atoms was exposed to a specially designed time dependent magnetic field…
Thorsten Koehler, Thomas Gasenzer, Keith BurnettSep 4, 2002
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Bose-Einstein Condensation on inhomogeneous networks: mesoscopic aspects versus thermodynamic limit
We study the filling of states in a pure hopping boson model on the comb lattice, a low dimensional discrete structure where geometrical inhomogeneity induces Bose-Einstein condensation (BEC) at…
P. Buonsante, R. Burioni, D. Cassi et al.Sep 4, 2002
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Sub-wetting layer continuum states in quantum dot samples
In the polar semiconductor samples of the self-organized quantum dots, grown by the Stranski-Krastanow growth method, the lowest energy extended states of the electronic excitations are assumed to be…
K. Kral, P. ZdenekSep 4, 2002
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X-ray-induced disordering of the dimerization pattern and apparent low-temperature enhancement of lattice symmetry in spinel CuIr2S4
At low temperatures, spinel CuIr2S4 is a charge-ordered spin-dimerized insulator with triclinic lattice symmetry. We find that x-rays induce a structural transition in which the local triclinic…
H. Ishibashi, T. Y. Koo, Y. S. Hor et al.Sep 4, 2002
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Tuning p-wave interactions in an ultracold Fermi gas of atoms
We have measured a p-wave Feshbach resonance in a single-component, ultracold Fermi gas of potassium atoms. We have used this resonance to enhance the normally suppressed p-wave collision…
C. A. Regal, C. Ticknor, J. L. Bohn et al.Sep 4, 2002
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Dynamically Stabilized Bright Solitons in a Two-Dimensional Bose-Einstein Condensate
We demonstrate that matter-wave bright solitons can be stabilized in 2D free space by causing the strength of interactions to oscillate rapidly between repulsive and attractive by using, e.g.,…
Hiroki Saito, Masahito UedaSep 3, 2002
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Statistical properties of neutral evolution
Neutral evolution is the simplest model of molecular evolution and thus it is most amenable to a comprehensive theoretical investigation. In this paper, we characterize the statistical properties of…
Ugo Bastolla, Markus Porto, H. Eduardo Roman et al.Sep 3, 2002
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Terahertz magneto-spectroscopy of transient plasmas in semiconductors
Using synchronized near-infrared (NIR) and terahertz (THz) lasers, we have performed picosecond time-resolved THz spectroscopy of transient carriers in semiconductors. Specifically, we measured the…
M. A. Zudov, A. P. Mitchell, A. H. Chin et al.Sep 3, 2002
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Watching a drunkard for ten nights: A study of distributions of variances
For any physical observable in statistical systems, the most frequently studied quantities are its average and standard deviation. Yet, its full distribution often carries extremely interesting…
R. K. P. Zia, B. SchmittmannSep 2, 2002
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Ultracold atoms and Bose-Einstein condensates in optical lattices
For ultracold and Bose-condensed atoms contained in periodic optical potential wells the quantized nature of their motion is clearly visible. The motion of the atomic wavepacket can also be…
O. Morsch, E. ArimondoSep 2, 2002
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Dynamics and phase evolution of Bose-Einstein condensates in one-dimensional optical lattices
We report experimental results on the dynamics and phase evolution of Bose-Einstein condensates in 1D optical lattices. The dynamical behaviour is studied by adiabatically loading the condensate into…
O. Morsch, M. Cristiani, J. H. Müller et al.Sep 2, 2002
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Duplication Models for Biological Networks
Are biological networks different from other large complex networks? Both large biological and non-biological networks exhibit power-law graphs (number of nodes with degree k, N(k) ~ k-b) yet the…
Fan Chung, Linyuan Lu, T. Gregory Dewey et al.Aug 31, 2002
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Exact-Exchange Density Functional Theory applied to a strongly inhomogeneous electron gas
A recently developed quasi two-dimensional exact-exchange formalism within the framework of Density Functional Theory has been applied to a strongly inhomogeneous interacting electron gas, and the…
S. Rigamonti, F. A. Reboredo, C. R. ProettoAug 31, 2002
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Ground state and elementary excitations of single and binary Bose-Einstein condensates of trapped dipolar gases
We analyze the ground-state properties and the excitation spectrum of Bose-Einstein condensates of trapped dipolar particles. First, we consider the case of a single-component polarized dipolar gas.…
K. Goral, L. SantosAug 30, 2002
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An analytic model of the shear modulus at all densities and temperatures
An analytic model of the shear modulus applicable at temperatures up to melt and at all densities is presented. It is based in part on a relation between the melting temperature and the shear modulus…
L. Burakovsky, C. W. Greeff, D. L. PrestonAug 29, 2002
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Ising magnets with mobile defects
Motivated by recent experiments on cuprates with low-dimensional magnetic interactions, a new class of two-dimensional Ising models with short-range interactions and mobile defects is introduced and…
W. Selke, V. L. Pokrovsky, B. Buechner et al.Aug 28, 2002
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Exact results for hydrogen recombination on dust grain surfaces
The recombination of hydrogen in the interstellar medium, taking place on surfaces of microscopic dust grains, is an essential process in the evolution of chemical complexity in interstellar clouds.…
Ofer Biham, Azi LipshtatAug 28, 2002
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On the Normal State Electronic properties of Layered Sr2 RuO4
Based on a comprehensive perusal of experimental results, we construct a microscopic model describing the normal state of layered 4d oxide Sr2 RuO4 incorporating relevant quantum chemical features…
M. S. Laad, E. Müller-HartmannAug 28, 2002
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Simulating Male Selfish Strategy in Reproduction Dispute
We introduce into the Penna Model for biological ageing one of the possible male mechanisms used to maximize the ability of their sperm to compete with sperm from other males. Such a selfish…
P. M. C de Oliveira, S. Moss de OliveiraAug 28, 2002
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Half-quantum vortices in strongly correlated Bose liquids
We discuss the structure of a vortex in a superfluid Bose liquid with a suppressed Bose-Einstein condensate and an intensive pair correlated condensate. The vortex represents the pair of half-quantum…
G. E. VolovikAug 28, 2002
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Discrete scale invariance, and its logarithmic extension
It is known that discrete scale invariance leads to log-periodic corrections to scaling. We investigate the correlations of a system with discrete scale symmetry, discuss in detail possible extension…
N. Abed-Pour, A. Aghamohammadi, M. Khorrami et al.Aug 28, 2002
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Bose-Einstein Condensates in Optical Lattices: Band-Gap Structure and Solitons
We analyze the existence and stability of spatially extended (Bloch-type) and localized states of a Bose-Einstein condensate loaded into an optical lattice. In the framework of the Gross-Pitaevskii…
Pearl J. Y. Louis, Elena A. Ostrovskaya, Craig M. Savage et al.Aug 27, 2002
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Electron Cascades Produced by Photoelectrons in Diamond
Secondary electron cascades are responsible for significant ionizations in macroscopic samples during irradiation with X-rays. A quantitative analysis of these cascades is needed, e.g. for assessing…
Beata Ziaja, Abraham Szoeke, Janos HajduAug 27, 2002
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Bader's interatomic surface and Bohmian mechanics
A Thomas-Fermi statistical analysis of Bader's interatomic surface developed in a previous work (L.Delle Site, Phys.Lett.A 286 61-64 (2001)) is here extended by considering exchange effects and…
L. Delle SiteAug 27, 2002
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Characterization of the stretched exponential trap-time distributions in one-dimensional coupled map lattices
Stretched exponential distributions and relaxation responses are encountered in a wide range of physical systems such as glasses, polymers and spin glasses. As found recently, this type of behavior…
S. I. Simdyankin, Normand Mousseau, E. R. HuntAug 26, 2002
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