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Condensed Matter papers — page 89

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X-ray dichroism and orbital anapoles
We present a theoretical analysis of photo-absorption spectroscopies in noncentrosymmetric systems, covering both x-ray and optical regions. Integrated dichroic spectra are interpreted using…
Paolo Carra, Andres Jerez, Ivan MarriApr 30, 2001
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Towards the fabrication of phosphorus qubits for a silicon quantum computer
The quest to build a quantum computer has been inspired by the recognition of the formidable computational power such a device could offer. In particular silicon-based proposals, using the nuclear or…
J. L. O'Brien, S. R. Schofield, M. Y. Simmons et al.Apr 30, 2001
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Vortex lattice formation in a rotating Bose-Einstein condensate
We study the dynamics of vortex lattice formation of a rotating trapped Bose-Einstein condensate by numerically solving the two-dimensional Gross-Pitaevskii equation, and find that the condensate…
Makoto Tsubota, Kenichi Kasamatsu, Masahito UedaApr 27, 2001
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Bose-Einstein Condensates with Large Number of Vortices
We show that as the number of vortices in a three dimensional Bose-Einstein Condensate increases, the system reaches a "quantum Hall" regime where the density profile is a Gaussian in the…
Tin-Lun HoApr 27, 2001
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Electron Quasiparticles Drive the Superconductor-to-Insulator Transition in Homogeneously Disordered Thin Films
Transport data on Bi, MoGe, and PbBi/Ge homogeneously-disordered thin films demonstrate that the critical resistivity, Rc, at the nominal insulator-superconductor transition is linearly…
Philip Phillips, Denis DalidovichApr 26, 2001
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Theoretical Study of Pressure Effect on TDAE-C60
We have theoretically studied pressure effects on molecular ferromagnet C60 complexes with tetrakis (dimethylamino) ethylene (TDAE), particularly the pressure-induced depression of the Curie…
Tohru Kawamoto, Madoka Tokumoto, Hirokazu Sakamoto et al.Apr 26, 2001
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Decoherence and dissipation during a quantum XOR gate operation
The dynamics of a quantum XOR gate operation in a two-qubit system being coupled to a bath of quantum harmonic oscillators is investigated. Upon applying the numerical quasiadiabatic propagator path…
Michael Thorwart, Peter HänggiApr 26, 2001
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Local Dynamics and Strong Correlation Physics I: 1D and 2D Half-filled Hubbard Models
We report on a non-perturbative approach to the 1D and 2D Hubbard models that is capable of recovering both strong and weak-coupling limits. We first show that even when the on-site Coulomb…
Tudor D. Stanescu, Philip PhillipsApr 25, 2001
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Phase transition in an asymmetric generalization of the zero-temperature q-state Potts model
An asymmetric generalization of the zero-temperature q-state Potts model on a one dimensional lattice, with and without boundaries, has been studied. The dynamics of the particle number, and…
N. Majd, A. Aghamohammadi, M. KhorramiApr 25, 2001
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Catastrophic senescence of the Pacific salmon without mutation-accumulation
We derive catastrophic senescence of the Pacific salmon from an aging model which was recently proposed by Stauffer. The model is based on the postulates of a minimum reproduction age and a maximal…
Hildegard Meyer-OrtmannsApr 25, 2001
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Vortex dynamics in two-dimensional systems at high driving forces
We study numerically the dynamics of two-dimensional vortex systems at zero temperature. In addition to pinned states and turbulent plastic flow, we find motion of vortices in rough channels along…
Hans Fangohr, Simon J. Cox, Peter A. J. de GrootApr 24, 2001
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Spectral fluctuations of the atomic vibrations in glasses: random matrix theory and beyond
It is demonstrated on a realistic model of amorphous alloy Si0.9Ge0.1 with 1000 atoms, that short-range spectral fluctuations of propagons and diffusons are universal and in agreement with…
Jaroslav FabianApr 24, 2001
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Thermal vs quantum decoherence in double well trapped Bose-Einstein condensates
The quantum and thermal fluctuations of the phase are investigated in a cold Bose gas confined by a double well trap. The coherence of the system is discussed in terms of the visibility of…
L. Pitaevskii, S. StringariApr 24, 2001
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Quantum Fractal Fluctuations
We numerically analyse quantum survival probability fluctuations in an open, classically chaotic system. In a quasi-classical regime, and in the presence of classical mixed phase space, such…
Giuliano Benenti, Giulio Casati, Italo Guarneri et al.Apr 24, 2001
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What was the temperature of the Bagsik financial oscillator?
We argue that the recently published by Przystawa and Wolf model of the Bagsik financial oscillator is oversimplified and unrealistic. We propose and analyze a refined explanation of this rare…
E. W. Piotrowski, J. SladkowskiApr 23, 2001
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Motion, creation and annihilation of disclinations in multi-domain structured nematic liquid crystal cells
We study dynamical processes in a multi-domain (MD) structured nematic liquid crystal cell with a particular emphasis on the motion, creation and annihilation of disclinations. In the MD cell right-…
M. Reichenstein, H. Stark, J. Stelzer et al.Apr 23, 2001
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Converting the reset
We give a simple algorithm to incorporate the effects of resets in convertible bond prices, without having to add an extra factor to take into account the value of the reset. Furthermore we show that…
J. K. Hoogland, C. D. D. Neumann, D. BlochApr 23, 2001
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Nonground State Condensates of Ultracold Trapped Atoms
The population dynamics of a trapped Bose-Einstein condensate, subject to the action of an oscillatory field, is studied. This field produces a modulation of the trapping potential with the frequency…
V. I. Yukalov, E. P. Yukalova, V. S. BagnatoApr 23, 2001
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Langevin dynamics of financial systems: a second-order analysis
We address the issue of stock market fluctuations within Langevin Dynamics (LD) and the thermodynamics definitions of multifractality in order to study its second-order characterization given by the…
E. CanessaApr 22, 2001
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Measuring the temporal coherence of an atom laser beam
We report on the measurement of the temporal coherence of an atom laser beam extracted from a 87Rb Bose-Einstein condensate. Reflecting the beam from a potential barrier creates a standing…
Michael Köhl, Theodor W. Hänsch, Tilman EsslingerApr 20, 2001
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Millikelvin magnetic relaxation measurements of alpha-Fe2O3 antiferromagnetic particles
In this paper we report magnetic relaxation data for antiferromagnetic alpha-Fe2O3 particles of 5 nm mean diameter in the temperature range 0.1 K to 25 K. The average spin value of these particles…
E. del Barco, J. M. Hernandez, M. Duran et al.Apr 20, 2001
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Quantum coherence of double-well BEC: a SU(2)-coherent-state path-integral approach
Macroscopic quantum coherence of Bose gas in a double-well potential is studied based on SU(2)-coherent-state path-integral. The ground state and fluctuations around it can be obtained by this…
Yi Zhou, Hui Zhai, Rong Lü et al.Apr 19, 2001
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Topological Reduction of Tight-Binding Models on Complex Networks
Complex molecules and mesoscopic structures are naturally described by general networks of elementary building blocks and tight-binding is one of the simplest quantum model suitable for studying the…
P. Buonsante, R. Burioni, D. CassiApr 19, 2001
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Theoretical confirmation of Feynman's Hypothesis on the creation of circular vortices in superfluid helium
The changes observed in the topology of superfluid helium vortices have intrigued people for some time now [1]. These vortices either extend from wall to wall, however tangled they may be in between,…
E. Infeld, A. SenatorskiApr 19, 2001
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Instability and wavelength selection during step flow growth of metal surfaces vicinal to fcc(001)
We study the onset and development of ledge instabilities during growth of vicinal metal surfaces using kinetic Monte Carlo simulations. We observe the formation of periodic patterns at [110] close…
M. Rusanen, I. T. Koponen, J. Heinonen et al.Apr 18, 2001
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