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Condensed Matter papers — page 45

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Universal scaling behavior of directed percolation and the pair contact process in an external field
We consider the scaling behavior of directed percolation and of the pair contact process with a conjugated field. In particular we determine numerically the equation of state and show that both…
S. Lubeck, R. D. WillmannOct 18, 2002
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Quantum phase transition in the Frenkel-Kontorova chain: from pinned instanton glass to sliding phonon gas
We study analytically and numerically the one-dimensional quantum Frenkel-Kontorova chain in the regime when the classical model is located in the pinned phase characterized by the gaped phonon…
O. V. Zhirov, G. Casati, D. L. ShepelyanskyOct 17, 2002
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Fractional power-law susceptibility and specific heat in low temperature insulating state of o-TaS3
Measurements of the magnetic susceptibility and its anisotropy in the quasi-one-dimensional system o-TaS3 in its low-T charge density wave (CDW) ground state are reported. Both sets of data reveal…
K. Biljakovic, M. Miljak, D. Staresinic et al.Oct 17, 2002
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Dynamics of liquid He-4 in confined geometries from Time-Dependent Density Functional calculations
We present numerical results obtained from Time-Dependent Density Functional calculations of the dynamics of liquid He-4 in different environments characterized by geometrical confinement. The…
Luigi Giacomazzi, Flavio Toigo, Francesco AncilottoOct 17, 2002
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A New face on old code
In science we often use established code that was developed many years ago. Frequently the documentation is lost and many of us know the feeling of putting a number in the wrong column and trying to…
P. F. Peterson, Th. ProffenOct 16, 2002
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Rotational and Vibrational Dynamics of Interstitial Molecular Hydrogen
The calculation of the hindered roton-phonon energy levels of a hydrogen molecule in a confining potential with different symmetries is systematized for the case when the rotational angular momentum…
T. Yildirim, A. B. HarrisOct 16, 2002
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Refraction at Media with Negative Refractive Index
We show that an electromagnetic (EM) wave undergoes negative refraction at the interface between a positive and negative refractive index material. Finite difference time domain (FDTD) simulations…
S. Foteinopoulou, E. N. Economou, C. M. SoukoulisOct 16, 2002
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Modernizing the ESRF beamline application software architecture with generic Python modules
We report on the modernization of the ESRF beamline application software with Python modules. The current building blocks used around the SPEC data acquisition software together with the new elements…
Jorg KloraOct 16, 2002
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Critical temperature of Bose-Einstein condensation in trapped atomic Bose-Fermi mixtures
We calculate the shift in the critical temperature of Bose-Einstein condensation for a dilute Bose-Fermi mixture confined by a harmonic potential to lowest order in both the Bose-Bose and Bose-Fermi…
Alexander P. Albus, Stefano Giorgini, Fabrizio Illuminati et al.Oct 16, 2002
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Spin dephasing in n-typed GaAs quantum wells in the presence of high magnetic fields in Voigt configuration
We perform a many-body study of the spin dephasing due to the D'yakonov-Perel' effect in n-typed GaAs (100) quantum wells under high magnetic fields in the Voigt configuration by constructing…
M. Q. Weng, M. W. WuOct 15, 2002
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Atoms and molecules in lattices: condensates built on a shared vacuum
In optical lattices where each site is occupied in its lowest energy state by a superposition of zero, one and two atoms, one can in a controllable manner convert the atomic pair into a molecule…
Tilman Esslinger, Klaus MolmerOct 15, 2002
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Phase diagram and influence of defects in the double perovskites
The phase diagram of the double perovskites of the type Sr2-x Lax Fe Mo O6 is analyzed, with and without disorder due to antisites. In addition to an homogeneous half metallic ferrimagnetic…
J. L. Alonso, L. A. Fernandez, F. Guinea et al.Oct 14, 2002
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Magnetic Quantum Oscillations of the Longitudinal Conductivity σzz in Quasi two-dimensional Metals
We derive an analytical expression for the longitudinal magnetoconductivity σzz in layered conductors in presence of a quantizing magnetic field perpendicular to the layers and for short-range…
T. Champel, V. P. MineevOct 14, 2002
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Electron iduced light emission in photonic crystals
The interaction of a fast electron with a photonic crystal is studied by solving the Maxwell equations exactly for the external field provided by the electron in the presence of the crystal. The…
L. A. Blanco, F. J. Garcia de AbajoOct 14, 2002
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Spectroscopy of capacitively coupled Josephson-junction qubits
We show that two capacitively-coupled Josephson junctions, in the quantum limit, form a simple coupled qubit system with effective coupling controlled by the junction bias currents. We compute…
Philip R. Johnson, Frederick W. Strauch, Alex J. Dragt et al.Oct 13, 2002
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Universal Features of the Time Evolution of Evanescent Modes in a Left-Handed Perfect Lens
The time evolution of evanescent modes in Pendry's perfect lens proposal for ideally lossless and homogeneous, left-handed materials is analyzed. We show that time development of sub-wavelength…
G. Gómez-SantosOct 12, 2002
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Stripe Formation in Bose-Einstein Condensates with Large Numbers of Vortices
We analyze recent experiments at JILA which observe periodic formation of stripes in a rotating Bose condensate [Engels et al. Phys. Rev. Lett. 89, 100403 (2002)], and explain this behavior as…
Erich J. Mueller, Tin-Lun HoOct 12, 2002
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Studies of transverse and longitudinal relaxations of 55Mn in molecular cluster magnet Mn12Ac
The transverse and longitudinal relaxation rates 1/T2 and 1/T1 of 55Mn in molecular cluster magnet Mn12Ac have been measured al low temperatures down to 200mK and in the fields upto…
T. Goto, T. Koshiba, T. Kubo et al.Oct 11, 2002
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The Bogoliubov Theory of a BEC in Particle Representation
In the number-conserving Bogoliubov theory of BEC the Bogoliubov transformation between quasiparticles and particles is nonlinear. We invert this nonlinear transformation and give general expression…
Jacek Dziarmaga, Krzysztof SachaOct 11, 2002
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The Renormalization Group and the Dynamics of Genetic Systems
In this brief article I show how the notion of coarse graining and the Renormalization Group enter naturally in the dynamics of genetic systems, in particular in the presence of recombination. I show…
Christopher R. StephensOct 11, 2002
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Characterization of the anticipated synchronization regime in the coupled FitzHugh--Nagumo model for neurons
We characterize numerically the regime of anticipated synchronization in the coupled FitzHugh-Nagumo model for neurons. We consider two neurons, coupled unidirectionally (in a master-slave…
Raul Toral, C. Masoller, Claudio R. Mirasso et al.Oct 11, 2002
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Superradiance of low density Frenkel excitons in a crystal slab of three-level atoms: Quantum interference effect
We systematically study the fluorescence of low density Frenkel excitons in a crystal slab containing NT V-type three-level atoms. Based on symmetric quasi-spin realization of SU(3) in large N…
G. R. Jin, P. Zhang, Yu-xi Liu et al.Oct 10, 2002
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Quantum phase transition in one-dimensional Bose-Einstein condensates with attractive interactions
Motivated by the recent development of the Feshbach technique, we studied the ground and low-lying excited states of attractive Bose-Einstein condensates on a one-dimensional ring as a function of…
Rina Kanamoto, Hiroki Saito, Masahito UedaOct 10, 2002
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Identification of polymorphs of pentacene
Pentacene crystallizes in a layered structure with a herringbone arrangement within the layers. The electronic properties depend strongly on the stacking of the molecules within the layers (Haddon et…
Christine C. Mattheus, Anne B. Dros, Jakob Baas et al.Oct 10, 2002
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6,13-dihydropentacene and pentacene single co-crystals
6,13-dihydropentacene and pentacene co-crystallise in a ratio of 2:1 during vapour transport of commercial pentacene in a gas flow. The crystal structure is monoclinic P21/n and contains one…
Christine C. Mattheus, Jakob Baas, Auke Meetsma et al.Oct 10, 2002
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