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Condensed Matter papers — page 82

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Anomalous dynamical light scattering in soft glassy gels
We compute the dynamical structure factor S(q,tau) of an elastic medium where force dipoles appear at random in space and in time, due to `micro-collapses' of the structure. Various regimes are…
J-P Bouchaud, E. PitardJul 23, 2001
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Finite size effects on the collective oscillations of a trapped Bose gas
Sum rules are used to calculate the corrections to the hydrodynamic collective frequencies of a harmonically trapped Bose gas at T=0, due to finite size effects. We show that, with logarithmic…
Francesca Zambelli, Sandro StringariJul 23, 2001
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Heating of Two-Dimensional Holes in SiGe and the B = 0 Metal-Insulator Transition
We study the resistivity vs. electric field dependence ρ(E) of a 2D hole system in SiGe close to the B=0 metal-insulator transition. Using ρ as a ``thermometer'' to obtain the effective…
R. Leturcq, D. L'Hote, R. Tourbot et al.Jul 23, 2001
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The Band Gap in Silicon Nanocrystallites
The gap in semiconductor nanocrystallites has been extensively studied both theoretically and experimentally over the last two decades. We have compared a recent ``state-of-the-art''…
V. Ranjan, Manish Kapoor, Vijay A. SinghJul 21, 2001
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Magnetic Susceptibility of the Balian-Werthamer Phase of 3He in Aerogel
The equilibrium superfluid phase of 3He impregnated into high-porosity silica aerogels appears to be a non-equal-spin-pairing state in zero field at all pressures, which is generally assumed to be…
Priya Sharma, J. A. SaulsJul 21, 2001
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More on A Statistical Analysis of Log-Periodic Precursors to Financial Crashes
We respond to Sornette and Johansen's criticisms of our findings regarding log-periodic precursors to financial crashes. Included in this paper are discussions of the Sornette-Johansen…
James A. FeigenbaumJul 20, 2001
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Effective Ginzburg-Landau model for superfluid 4 He
We propose an effective Ginzburg-Landau energy functional for superfluid helium that is motivated by the ideal Bose gas model. The parameters of this phenomenological model are adjusted to known…
T. FliessbachJul 20, 2001
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Field Induced Partial Order in the Spin-Ice Dysprosium Titanate
Neutron scattering has been used to investigate the magnetic correlations in the the spin ice material dysprosium titanate, Dy2Ti2O7. An isotopically enriched sample was used to minimise neutron…
T. Fennell, O. A. Petrenko, G. Balakrishnan et al.Jul 19, 2001
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Field-domain spintronics in magnetic semiconductor multiple quantum wells
We develop a theory of non-linear growth direction transport in magnetically doped II-VI compound semiconductor multiple-quantum-well systems. We find that the formation of electric field domains can…
David Sanchez, A. H. MacDonald, Gloria PlateroJul 19, 2001
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Origin of heavy quasiparticles in UPt3
We propose a microscopic description of heavy fermions in UPt3. It is based on the assumption that two of the three 5f electrons of the U ions are localized. Band-structure calculations based on…
G. Zwicknagl, A. N. Yaresko, P. FuldeJul 18, 2001
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Spectral Properties of the k-Body Embedded Gaussian Ensembles of Random Matrices for Bosons
We consider m spinless Bosons distributed over l degenerate single-particle states and interacting through a k-body random interaction with Gaussian probability distribution (the Bosonic…
T. Asaga, L. Benet, T. Rupp et al.Jul 17, 2001
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Friction force on a vortex due to the scattering of superfluid excitations in helium II
The longitudinal friction acting on a vortex line in superfluid 4He is investigated within a simple model based on the analogy between such vortex dynamics and that of the quantal Brownian motion…
H. M. Cataldo, D. M. JezekJul 17, 2001
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Non-Ergodic Behaviour of the k-Body Embedded Gaussian Random Ensembles for Bosons
We investigate the shape of the spectrum and the spectral fluctuations of the k-body Embedded Gaussian Ensemble for Bosons in the dense limit, where the number of Bosons m ∞ while both…
T. Asaga, L. Benet, T. Rupp et al.Jul 17, 2001
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Does Berry phase exist for a system coupled to its environment?
Berry phase was originally defined for systems whose states are separated by finite energy gaps. One might naively expect that a system without a gap cannot have a Berry phase. Despite this we ask…
Robert S. Whitney, Yuval GefenJul 17, 2001
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Confined states in two-dimensional flat elliptic quantum dots and elliptic quantum wires
The energy spectrum and corresponding wave functions of a flat quantum dot with elliptic symmetry are obtained exactly. A detailed study is made of the effect of ellipticity on the energy levels and…
M. van den Broek, F. M. PeetersJul 16, 2001
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Interaction induced localization in a gas of pyramidal molecules
We propose a model to describe a gas of pyramidal molecules interacting via dipole-dipole interactions. The interaction modifies the tunneling properties between the classical equilibrium…
Giovanni Jona-Lasinio, Carlo Presilla, Cristina ToninelliJul 16, 2001
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Environment induced localization and superselection rules in a gas of pyramidal molecules
We propose a model to describe a gas of pyramidal molecules interacting via dipole-dipole interactions. A cooperative effect induced by the interaction modifies the tunneling properties between the…
Giovanni Jona-Lasinio, Carlo Presilla, Cristina ToninelliJul 16, 2001
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Application a-Si:H and Its Alloys for Photoreceptor Devices
Photoreceptor devices have been fabricated for positive corona with multi-layer structure of glass/ZnO /i-a-SiC:H /i-a-Si:H /p-a-SiC:H /Al type by using dual chamber plasma enhanced chemical vapor…
Darsikin, D. M. Jasruddin, H. Saragih et al.Jul 16, 2001
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Skyrmion Physics in Bose-Einstein Ferromagnets
We show that a ferromagnetic Bose-Einstein condensate has not only line-like vortex excitations, but in general also allows for point-like topological excitations, i.e., skyrmions. We discuss the…
U. Al Khawaja, H. T. C. StoofJul 13, 2001
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Transport and dynamics on open quantum graphs
We study the classical limit of quantum mechanics on graphs by introducing a Wigner function for graphs. The classical dynamics is compared to the quantum dynamics obtained from the propagator. In…
Felipe Barra, Pierre GaspardJul 13, 2001
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Mean-field analysis of collapsing and exploding Bose-Einstein condensates
The dynamics of collapsing and exploding trapped Bose-Einstein condensat es caused by a sudden switch of interactions from repulsive to attractive a re studied by numerically integrating the…
Hiroki Saito, Masahito UedaJul 12, 2001
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The Hydrodynamical Limit of Quantum Hall system
We study the current algebra of FQHE systems in the hydrodynamical limit of small amplitude, long-wavelength fluctuations. We show that the algebra simplifies considerably in this limit. The…
D. Sreedhar Babu, R. Shankar, M. SivakumarJul 12, 2001
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Short-range correlation in the uniform electron gas: Extended Overhauser model
We use the two-electron wavefunctions (geminals) and the simple screened Coulomb potential proposed by Overhauser [Can. J. Phys. 73, 683 (1995)] to compute the pair-distribution function for a…
Paola Gori-Giorgi, John P. PerdewJul 12, 2001
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The Onset of Mackey-Glass Leukemia at the Edge of Chaos
In this paper we revisit the Mackey-Glass model for blood-forming process, which was proposed to describe the spontaneous fluctuations of the blood cell counts in normal individuals and the first…
M. F. Menezes, R. M. Zorzenon dos SantosJul 12, 2001
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Augmented space recursion for partially disordered systems
Off-stoichiometric alloys exhibit partial disorder, in the sense that only some of the sublattices of the stoichiometric ordered alloy become disordered. This paper puts forward a generalization of…
Atisdipankar Chakrabarti, Abhijit MookerjeeJul 12, 2001
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