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Condensed Matter papers — page 25

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Functional Renormalization Group at Large N for Disordered Elastic Systems, and Relation to Replica Symmetry Breaking
We study the replica field theory which describes the pinning of elastic manifolds of arbitrary internal dimension d in a random potential, with the aim of bridging the gap between mean field and…
Pierre Le Doussal, Kay Joerg WieseMay 28, 2003
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Dynamics of a classical gas including dissipative and mean field effects
By means of a scaling ansatz, we investigate an approximated solution of the Boltzmann-Vlasov equation for a classical gas. Within this framework, we derive the frequencies and the damping of the…
P. Pedri, D. Guéry-Odelin, S. StringariMay 27, 2003
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On a non-linear Fluctuation Theorem for the aging dynamics of disordered trap models
We consider the dynamics of the disordered trap model, which is known to be completely out-of-equilibrium and to present strong localization effects in its aging phase. We are interested into the…
Cecile MonthusMay 27, 2003
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Hartree-Fock-Bogoliubov theory versus local-density approximation for superfluid trapped fermionic atoms
We investigate a gas of superfluid fermionic atoms trapped in two hyperfine states by a spherical harmonic potential. We propose a new regularization method to remove the ultraviolet divergence in…
Marcella Grasso, Michael UrbanMay 26, 2003
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On the Tomography of Networks and Multicast Trees
In this paper we model the tomography of scale free networks by studying the structure of layers around an arbitrary network node. We find, both analytically and empirically, that the distance…
R. Cohen, D. Dolev, S. Havlin et al.May 25, 2003
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Collective excitations in trapped boson-fermion mixtures: from demixing to collapse
We calculate the spectrum of low-lying collective excitations in a gaseous cloud formed by a Bose-Einstein condensate and a spin-polarized Fermi gas over a range of the boson-fermion coupling…
P. Capuzzi, A. Minguzzi, M. P. TosiMay 23, 2003
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Layer- and bulk roton excitations of 4He in porous media
We examine the energetics of bulk and layer-roton excitations of 4He in various porous medial such as aerogel, Geltech, or Vycor, in order to find out what conclusions can be drawn from experiments…
V. Apaja, E. KrotscheckMay 23, 2003
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Coherent Spin Oscillations in a Disordered Magnet
Most materials freeze when cooled to sufficiently low temperature. We find that magnetic dipoles randomly distributed in a solid matrix condense into a spin liquid with spectral properties on cooling…
S. Ghosh, R. Parthasarathy, T. F. Rosenbaum et al.May 22, 2003
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Bias-voltage dependence of the magneto-resistance in ballistic vacuum tunneling: Theory and application to planar Co(0001) junctions
Motivated by first-principles results for jellium and by surface-barrier shapes that are typically used in electron spectroscopies, the bias voltage in ballistic vacuum tunneling is treated in a…
J. Henk, P. BrunoMay 22, 2003
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Quantitative test of thermal field theory for Bose-Einstein condensates
We present numerical results from a full second order quantum field theory of Bose-Einstein condensates applied to the 1997 JILA experiment [D. S. Jin et al., Phys. Rev. Lett. Vol. 78, 764 (1997)].…
S. A. Morgan, M. Rusch, D. A. W. Hutchinson et al.May 22, 2003
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Stability of the iterative solutions of integral equations as one phase freezing criterion
A recently proposed connection between the threshold for the stability of the iterative solution of integral equations for the pair correlation functions of a classical fluid and the structural…
R. Fantoni, G. PastoreMay 22, 2003
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Spin polarization of the L-gap surface states on Au(111)
The electron spin polarization (ESP) of the L-gap surface states on Au(111) is investigated theoretically by means of first-principles electronic-structure and photoemission calculations. The surface…
J. Henk, A. Ernst, P. BrunoMay 22, 2003
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Effects of interatomic collisions on atom laser outcoupling
We present a computational approach to the outcoupling in a simple one-dimensional atom laser model, the objective being to circumvent mathematical difficulties arising from the breakdown of the Born…
Georgios M. Nikolopoulos, P. Lambropoulos, N. P. ProukakisMay 22, 2003
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Finite temperature behavior of impurity doped Lithium cluster viz Li6Sn
We have carried out extensive isokinetic ab initio molecular dynamic simulations to investigate the finite temperature properties of the impurity doped cluster Li6Sn along with the host…
Kavita Joshi, D. G. KanhereMay 22, 2003
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Resonant Bose Condensate: Analog of Resonant Atom
The resonant formation of nonlinear coherent modes in trapped Bose-Einstein condensates is studied. These modes represent nonground-state Bose condensates. The methods of describing the spectrum of…
V. I. Yukalov, E. P. Yukalova, V. S. BagnatoMay 21, 2003
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Arbitrage risk induced by transaction costs
We discuss the time evolution of quotation of stocks and commodities and show that they form an Ising chain. We show that transaction costs induce arbitrage risk that usually is neglected. The full…
E. W. Piotrowski, J. SladkowskiMay 20, 2003
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Weak Localization in an Ultradense 2D Electron Gas in δ-doped Silicon
An ultradense 2D electron system can be realized by adsorbing PH3 precursor molecules onto an atomically clean Si surface, followed by epitaxial Si overgrowth. By controlling the PH3 coverage…
M. A. Zudov, C. L. Yang, R. R. Du et al.May 20, 2003
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Imaging with an Almost Perfect Lens
The problem of imaging for a nearly-perfect lens, namely, a slab of a left-handed material with refractive index n = -(1-sigma)1/2 is solved analytically for |sigma| << 1. The electromagnetic field…
R. MerlinMay 19, 2003
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The Design of Life: Information Technology, "Knapsack" and "Synprops" Used to Engineer the Sequence of Amino Acid Residues in Proteins
An In Silico model to relate the properties of proteins to the structure, sequence, function and evolutionary history of proteins is shown. The derived ideal sequences for amino acid residues in…
S. BumbleMay 19, 2003
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Manipulation of spin dephasing in InAs quantum wires
The spin dephasing due to the Rashba spin-orbit coupling, especially its dependence on the direction of the electric field is studied in InAs quantum wire. We find that the spin dephasing is strongly…
J. L. Cheng, M. Q. Weng, M. W. WuMay 19, 2003
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The Gross-Pitaevskii equation and higher order theories in one-dimensional Bose gases
We investigate the properties of the one-dimensional Bose gas at zero temperature, for which exact results exist for some model systems. We treat the interactions between particles in the gas with an…
M. D. Lee, S. A. Morgan, K. BurnettMay 18, 2003
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Limit of Field Effect Mobility on Pentacene Single Crystal
We report on fabrication and characterization of field effect transistors (FETs) on single-crystal pentacene. These FETs exhibit hole conductivity with room temperature effective mobility up to 0.30…
V. Y. Butko, X. Chi, D. V. Lang et al.May 16, 2003
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High temperature gate control of quantum well spin memory
Time-resolved optical measurements in (110)-oriented GaAs/AlGaAs quantum wells show a ten-fold increase of the spin-relaxation rate as a function of applied electric field from 20 to 80 kV cm-1 at…
O. Z. Karimov, G. H. John, R. T. Harley et al.May 16, 2003
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Nonlinear Supratransmission
A nonlinear system possessing a natural forbidden band gap can transmit energy of a signal with a frequency in the gap, as recently shown for the nonlinear chain of coupled pendula [Phys Rev Lett 89…
Jerome Leon, Frederic GenietMay 16, 2003
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Field-doping of C60 crystals: Polarization and Stark splitting
We investigate the possibility of doping C60 crystals by applying a strong electric field. For an accurate description of a C60 field-effect device we introduce a multipole expansion of the field,…
S. Wehrli, E. Koch, M. SigristMay 15, 2003
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