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Condensed Matter papers — page 27

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Probing Human Response Times
In a recent preprint eck, the temporal dynamics of an e-mail network has been investigated by J.P. Eckmann, E. Moses and D. Sergi. Specifically, the time period between an e-mail message and…
Anders JohansenMay 5, 2003
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Shot noise of spin current
We report an exact solution for the noise spectrum of spin-current without charge-current in a spin field effect transistor (SFET). For the SFET with two leads, it is found that both auto- and…
Baigeng Wang, Jian Wang, Hong GuoMay 5, 2003
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Correlated N-boson systems for arbitrary scattering length
We investigate systems of identical bosons with the focus on two-body correlations and attractive finite-range potentials. We use a hyperspherical adiabatic method and apply a Faddeev type of…
O. Sørensen, D. V. Fedorov, A. S. JensenMay 2, 2003
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A traffic lights approach to PD validation
As a consequence of the dependence experienced in loan portfolios, the standard binomial test which is based on the assumption of independence does not appear appropriate for validating probabilities…
Dirk TascheMay 2, 2003
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A simple harmonic model as a caricature for mismatch and relaxation effects for ion hopping dynamics in solid electrolytes
We formulate a simple harmonic mean-field model with N+1 particles and analyse the relaxation processes following a jump of one of these particles. Either the particle can jump back (single-particle…
Magnus Kunow, Andreas HeuerMay 2, 2003
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A Model of Barchan Dunes Including Lateral Shear Stress
Barchan dunes are found where sand availability is low and wind direction quite constant. The two dimensional shear stress of the wind field and the sand movement by saltation and avalanches over a…
V. Schwaemmle, H. HerrmannMay 2, 2003
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Quantum destruction of stiffness in diluted antiferromagnets and superconductors
The reduction of 2D superconducting or antiferromagnetic order by random dilution is studied as a model for the 2D diluted Heisenberg antiferromagnet (DHAF) La2Cu1-p(Zn,Mg)pO4 and…
N. Bray-Ali, J. E. MooreMay 1, 2003
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Creation of ultracold molecules from a Fermi gas of atoms
Since the realization of Bose-Einstein condensates (BEC) in atomic gases an experimental challenge has been the production of molecular gases in the quantum regime. A promising approach is to create…
C. A. Regal, C. Ticknor, J. L. Bohn et al.May 1, 2003
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Phase transitions, memory and frustration in a Sznajd-like model with synchronous updating
We introduce a consensus model inspired by the Sznajd Model. The updating is synchronous and memory plays here a decisive role in making possible the reaching of total consensus. We study the phase…
Lorenzo Sabatelli, Peter RichmondMay 1, 2003
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Classical technical analysis of Latin American market indices. Correlations in Latin American currencies (ARS, CLP, MXP) exchange rates with respect to DEM, GBP, JPY and USD
The classical technical analysis methods of financial time series based on the moving average and momentum is recalled. Illustrations use the IBM share price and Latin American (Argentinian MerVal,…
M. Ausloos, K. IvanovaApr 30, 2003
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Incomplete electronic relaxation and population upconversion in quantum dots
We calculate the electronic relaxation of a single electron in a quantum dot with two electronic orbital states, and with the electronic coupling to the longitudinal optical modes of the lattice…
K. Kral, Z. Khas, P. ZdenekApr 30, 2003
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Equation of state and phonon frequency calculations of diamond at high pressures
The pressure-volume relationship and the zone-center optical phonon frequency of cubic diamond at pressures up to 600 GPa have been calculated based on Density Functional Theory within the Local…
K. Kunc, I. Loa, K. SyassenApr 30, 2003
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Bose-Einstein condensation of indirect excitons in coupled quantum wells
We study the ground-state properties of a quasi-two-dimensional Bose-Einstein condensate of indirect excitons, which are confined in an anisotropic harmonic potential. Incorporating the interactions,…
G. M. KavoulakisApr 30, 2003
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Induced vs Spontaneous Breakdown of S-matrix Unitarity: Probability of No Return in Quantum Chaotic and Disordered Systems
We investigate systematically sample-to sample fluctuations of the probability τ of no return into a given entrance channel for wave scattering from disordered systems. For zero-dimensional…
Yan V. FyodorovApr 29, 2003
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Violation of self-similarity in the expansion of a 1D Bose gas
The expansion of a 1D Bose gas is investigated employing the Lieb-Liniger equation of state within the local density approximation. We show that during the expansion the density profile of the gas…
P. Pedri, L. Santos, P. Ohberg et al.Apr 29, 2003
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Schemes for loading a Bose-Einstein condensate into a two-dimensional dipole trap
We propose two loading mechanisms of a degenerate Bose gas into a surface trap. This trap relies on the dipole potential produced by two evanescent optical waves far detuned from the atomic…
Yves Colombe, Demascoth Kadio, Maxim Olshanii et al.Apr 29, 2003
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An ab-initio many-body method for electronic structure calculations of solids. II. Unscreened Hartree-Fock treatment for the 3d systems Fe, Co, Ni and Cu
The ab-initio many-body method suggested in the preceding paper is applied to the 3d transition metals Fe, Co, Ni, and Cu. We use a linearized muffin-tin orbital calculation to determine Bloch…
I. Schnell, G. Czycholl, R. C. AlbersApr 28, 2003
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An ab-initio many-body method for electronic structure calculations of solids. I. Description of the method
We propose a new, alternative method for ab-initio calculations of the electronic structure of solids, which has been specifically adapted to treat many-body effects in a more rigorous way than many…
I. Schnell, G. Czycholl, R. C. AlbersApr 28, 2003
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Rapid Acquisition Pair Distribution Function (RA-PDF) Analysis
An image plate (IP) detector coupled with high energy synchrotron radiation was used for atomic pair distribution function (PDF) analysis, with high probed momentum transfer ≤ 28.5 …
Peter J. Chupas, Xiangyun Qiu, Jonathan C. Hanson et al.Apr 28, 2003
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Effect of annealing on magnetic and magnetotransport properties of Ga1-xMnxAs epilayers
High-field magnetic measurements performed with the use of magnetooptical Kerr effect (MOKE) in the polar configuration as well as high-field and low-field magnetotransport studies were carried out…
I. Kuryliszyn-Kudelska, T. Wojtowicz, X. Liu et al.Apr 28, 2003
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Functional Renormalization Group and the Field Theory of Disordered Elastic Systems
We study elastic systems such as interfaces or lattices, pinned by quenched disorder. To escape triviality as a result of ``dimensional reduction'', we use the functional renormalization…
Pierre Le Doussal, Kay Joerg Wiese, Pascal ChauveApr 27, 2003
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Fermi edge singularity in a non-equilibrium system
We report exact results for the Fermi Edge Singularity in the absorption spectrum of an out-of-equilibrium tunnel junction. We consider two metals with chemical potential difference V separated by a…
B. Muzykantskii, N. d'Ambrumenil, B. BrauneckerApr 25, 2003
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Dispersion management for atomic matter waves
We demonstrate the control of the dispersion of matter wave packets utilizing periodic potentials. This is analogous to the technique of dispersion management known in photon optics. Matter wave…
B. Eiermann, P. Treutlein, Th. Anker et al.Apr 25, 2003
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Transition to superfluid turbulence governed by an intrinsic parameter
Hydrodynamic flow in both classical and quantum fluids can be either laminar or turbulent. To describe the latter, vortices in turbulent flow are modelled with stable vortex filaments. While this is…
A. P. Finne, T. Araki, R. Blaauwgeers et al.Apr 25, 2003
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Universality and Shannon entropy of codon usage
The distribution functions of the codon usage probabilities, computed over all the available GenBank data, for 40 eukaryotic biological species and 5 chloroplasts, do not follow a Zipf law, but are…
L. Frappat, A. Sciarrino, P. SorbaApr 25, 2003
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