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Condensed Matter papers — page 88

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Hot Electron Magnetotransport in a Spin-Valve Transistor at Finite temperatures
The hot electron magnetotransport in a spin-valve transistor has been theoretically explored at finite temperatures. We have explored the parallel and anti-parallel collector current changing the…
Jisang HongMay 9, 2001
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Testing the Zurek-Kibble Causality Bounds with Annular Josephson Tunnel Junctions
Zurek has provided simple causal bounds for the onset of phase transitions in condensed matter, that mirror those proposed by Kibble for relativistic quantum field theory. In this paper we show how…
Roberto Monaco, Ray Rivers, Eleftheria KavoussanakiMay 9, 2001
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Temperature Dependence of Magneto Current in Spin Valve Transistor: A phenomenological Study
The temperature dependence of magneto current in the spin spin valve transistor system is theoretically explored based on phenomenological model. We find that the collector current strongly depends…
Jisang Hong, P. S. Anil KumarMay 9, 2001
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The Contribution of Hot Electron Spin Polarization to the Magnetotransport in a Spin-Valve Transistor at Finite Temperatures
The effect of spin mixing due to thermal spin waves and temperature dependence of hot electron spin polarization to the collector current in a spin-valve transistor has been theoretically explored.…
Jisang Hong, P. S. Anil KumarMay 9, 2001
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Phase Diagram of the Spin-Orbital model on the Square Lattice
We study the phase diagram of the spin-orbital model in both the weak and strong limits of the quartic spin-orbital exchange interaction. This allows us to study quantum phase transitions in the…
E. Zasinas, O. P. Sushkov, J. OitmaaMay 9, 2001
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Bias Voltage and Temperature Dependence of Hot Electron Magnetotransport
We present a qualitative model study of energy and temperature dependence of hot electron magnetotransport. This model calculations are based on a simple argument that the inelastic scattering…
Jisang HongMay 8, 2001
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Zurek-Kibble Causality Bounds in Time-Dependent Ginzburg-Landau Theory and Quantum Field Theory
Zurek's and Kibble's causal constraints for defect production at continuous transitions are encoded in the field equations that condensed matter systems and quantum fields satisfy. In this…
R. J. RiversMay 8, 2001
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Dissimilar Ferromagnetic Layer Dependence of Hot Electron Magnetotransport
The material dependence of hot electron magnetotransport in a spin-valve transistor has been theoretically explored. We calculate the parallel and anti-parallel collector current changing the types…
Jisang HongMay 8, 2001
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Wigner quasi-distribution function for charged particles in classical electromagnetic fields
A gauge-invariant Wigner quasi-distribution function for charged particles in classical electromagnetic fields is derived in a rigorous way. Its relation to the axial gauge is discussed, as well as…
M. Levanda, V FleurovMay 7, 2001
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Rejuvenation in the Random Energy Model
We show that the Random Energy Model has interesting rejuvenation properties in its frozen phase. Different `susceptibilities' to temperature changes, for the free-energy and for other…
Marta Sales, Jean-Philippe BouchaudMay 7, 2001
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Exactly solvable models through the empty interval method
The most general one dimensional reaction-diffusion model with nearest-neighbor interactions, which is exactly-solvable through the empty interval method, has been introduced. Assuming…
M. Alimohammadi, M. Khorrami, A. AghamohammadiMay 6, 2001
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Phase diagram of the XXZ chain with next-nearest-neighbor interactions
We calculate the quantum phase diagram of the XXZ chain with nearest-neighbor (NN) J1 and next-NN exchange J2 with anisotropies Δ1 and Δ2 respectively. In particular we…
R. D. Somma, A. A. AligiaMay 5, 2001
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Zero sound density oscillations in Fermi-Bose mixtures
Within a mean field plus Random-Phase Approximation formalism, we investigate the collective excitations of a three component Fermi-Bose mixture of K atoms, magnetically trapped and subjected to…
P. Capuzzi, E. S. HernandezMay 4, 2001
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Bulk Flow Regimes and Fractional Flow in 2D Porous Media by Numerical Simulations
We investigate a two-dimensional network simulator that model the dynamics of two-phase immiscible bulk flow where film flow can be neglected. We present a method for simulating the detailed…
Henning Arendt Knudsen, Eyvind Aker, Alex HansenMay 4, 2001
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Bose-Einstein condensates in atomic gases: simple theoretical results
These notes present simple theoretical approaches to study Bose-Einstein condensation in trapped atomic gases and their comparison to recent experimental results : - the ideal Bose gas model - Fermi…
Yvan CastinMay 3, 2001
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Fourier-Space Crystallography as Group Cohomology
We reformulate Fourier-space crystallography in the language of cohomology of groups. Once the problem is understood as a classification of linear functions on the lattice, restricted by a particular…
David A. Rabson, Benji FisherMay 2, 2001
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Prewetting transition on a weakly disordered substrate : evidence for a creeping film dynamics
We present the first microscopic images of the prewetting transition of a liquid film on a solid surface. Pictures of the local coverage map of a helium film on a cesium metal surface are taken while…
X. Muller, J. Dupont-RocMay 2, 2001
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Order in the Heisenberg Pyrochlore: The Magnetic Structure of Gd2Ti2O7
The rare earth pyrochlore material Gd2Ti2O7 is considered to be an ideal model frustrated Heisenberg antiferromagnet with additional dipolar interactions. For this system there are several untested…
J. D. M. Champion, A. S. Wills, T. Fennell et al.May 2, 2001
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Excited States of the Cooper Problem in a Three-Dimensional Disordered System
This work presents the study of the excited states of the Cooper problem in the three-dimensional Anderson model. It is shown that the excited pair states remain localized while their excitation…
J. LagesMay 2, 2001
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Binary self-similar one-dimensional quasilattices: Mutual local-derivability classification and substitution rules
Self-similar binary one-dimensional (1D) quasilattices (QLs) are classified into mutual local-derivability (MLD) classes. It is shown that the MLD classification is closely related to the…
Masashi Torikai, Komajiro Niizeki, Takashi OdagakiMay 2, 2001
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Comment on "Efficient, multiple-range random walk algorithm to calculate the density of states"
Comment an the recent Letter [Phys. Rev. Lett. 86, 2050 (2001)] by F.Wang and D. P. Landau.
Alfred Hueller, Michel PleimlingMay 2, 2001
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Semiclassical Mechanics of Rotons
The elementary excitations in superfluid liquid He-4 named rotons have an unusual dispersion curve. The energy is an approximately quadratic function of (p-p0), the difference between the magnitude…
T. M. SandersMay 1, 2001
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Spin-Charge Decoupling and Orthofermi Quantum Statistics
Currently Gutzwiller projection technique and nested Bethe ansatz are two main methods used to handle electronic systems in the U infinity limit. We demonstrate that these two approaches describe…
A. K. MishraMay 1, 2001
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Stable ultrahigh-density magneto-optical recordings using introduced linear defects
The stability of data bits in magnetic recording media at ultrahigh densities is compromised by thermal `flips' -- magnetic spin reversals -- of nano-sized spin domains, which erase the stored…
L. Krusin-Elbaum, T. Shibauchi, B. Argyle et al.May 1, 2001
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Charged fixed point in the Ginzburg-Landau superconductor and the role of the Ginzburg parameter κ
We present a semi-perturbative approach which yields an infrared-stable fixed point in the Ginzburg-Landau for N=2, where N/2 is the number of complex components. The calculations are done in d=3…
Hagen Kleinert, Flavio S. NogueiraApr 30, 2001
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