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Condensed Matter papers — page 39

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Scaling and nonscaling finite-size effects in the Gaussian and the mean spherical model with free boundary conditions
We calculate finite-size effects of the Gaussian model in a L× Ld-1 box geometry with free boundary conditions in one direction and periodic boundary conditions in d-1 directions for…
X. S. Chen, V. DohmDec 16, 2002
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Symmetry of anisotropic exchange interactions in semiconductor nanostructures
The symmetry of exchange interaction of charge carriers in semiconductor nanostructures (quantum wells and quantum dots) is analysed. It is shown that the exchange Hamiltonian of two particles…
K. V. KavokinDec 14, 2002
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Specific heat of the quantum Bragg Glass
We study the thermodynamics of the vibrational modes of a lattice pinned by impurity disorder in the absence of topological defects (Bragg glass phase). Using a replica variational method we compute…
Gregory Schehr, Thierry Giamarchi, Pierre Le DoussalDec 12, 2002
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Soliton-sound interactions in quasi-one-dimensional Bose-Einstein condensates
Longitudinal confinement of dark solitons in quasi-one-dimensional Bose-Einstein condensates leads to sound emission and reabsorption. We perform quantitative studies of the dynamics of a soliton…
N. G. Parker, N. P. Proukakis, M. Leadbeater et al.Dec 12, 2002
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New type of lenses based upon left-handed materials
New type of lenses which are a slab of a left-handed material embedded into a regular material is proposed. These two materials should have equal refractive indices. Lenses with a focal length larger…
A. L. Pokrovsky, A. L. EfrosDec 12, 2002
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Transition from molecular complex to quantum solvation in OCS(He)N
We present quantum calculations of the rotational energy levels and spectroscopic rotational constants of the linear OCS molecule in variable size clusters of 4He, using spectral evolution quantum…
F. Paesani, A. Viel, F. A. Gianturco et al.Dec 12, 2002
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Entanglement and spin squeezing of Bose condensed atoms
We propose a direct, coherent coupling scheme that can create massively entangled states of Bose-Einstein condensed atoms. Our idea is based on an effective interaction between two atoms from…
M. Zhang, Kristian Helmerson, L. YouDec 12, 2002
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Finite-size effects on the thermal conductivity of 4He near Tλ
We present results of a renormalization-group calculation of the thermal conductivity of confined 4He in a L2 × ∞ geometry above and at Tλ within model F with Dirichlet boundary…
Michael Toepler, Volker DohmDec 12, 2002
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From boom to bust and back again: the complex dynamics of trends and fashions
Social trends or fashions are spontaneous collective decisions made by large portions of a community, often without an apparent good reason. The spontaneous formation of trends provides a well…
Luis M. A. BettencourtDec 12, 2002
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Structure, rotational dynamics, and superfluidity of small OCS-doped He clusters
The structural and dynamical properties of OCS molecules solvated in Helium clusters are studied using reptation quantum Monte Carlo, for cluster sizes n=3-20 He atoms. Computer simulations allow us…
Saverio Moroni, Antonio Sarsa, Stefano Fantoni et al.Dec 12, 2002
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A cellular automaton model of gravitational clustering
Gravitational clustering of a random distribution of point masses is dominated by the effective short-range interactions due to large-scale isotropy. We introduce a one-dimensional cellular automaton…
Roya Mohayaee, Luciano PietroneroDec 12, 2002
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Rational sequences for the conductance in quantum wires from affine Toda field theories
We analyse the expression for the conductance of a quantum wire which is decribed by an integrable quantum field theory. In the high temperature regime we derive a simple formula for the filling…
Olalla A. Castro-Alvaredo, Andreas FringDec 11, 2002
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Coercive Field and Magnetization Deficit in Ga(1-x)Mn(x)As Epilayers
We have studied the field dependence of the magnetization in epilayers of the diluted magnetic semiconductor Ga(1-x)Mn(x)As for 0.0135 < x < 0.083. Measurements of the low temperature magnetization…
S. J. Potashnik, K. C. Ku, S. H. Chun et al.Dec 11, 2002
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Dynamics of glassy systems
These lecture notes can be read in two ways. The first two Sections contain a review of the phenomenology of several physical systems with slow nonequilibrium dynamics. In the Conclusions we…
Leticia F. CugliandoloDec 11, 2002
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Localization properties of the anomalous diffusion phase x ~ tμ in the directed trap model and in the Sinai diffusion with bias
We study the anomalous diffusion phase x ~ tμ with 0<μ<1 which exists both in the Sinai diffusion at small bias, and in the related directed trap model presenting a large distribution of…
Cecile MonthusDec 10, 2002
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Thermal Conductivity of Superfluid 3He in Aerogel
We report theoretical calculations of the thermal conductivity of 3He impregnated into high-porosity aerogel and compare these results with available experimental data.
Priya Sharma, J. A. SaulsDec 10, 2002
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Kohn-Luttinger instability of the t-t' Hubbard model in two dimensions: variational approach
An effective Hamiltonian for the Kohn-Luttinger superconductor is constructed and solved in the BCS approximation. The method is applied to the t-t' Hubbard model in two dimensions with the…
J. Mraz, R. HlubinaDec 9, 2002
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Diverging magnetothermal response in the one-dimensional Heisenberg chain
A current of magnetic moments will flow in the spin-1/2 Heisenberg chain in the presence of an external magnetic field B and a temperature gradient ΔT along the chain. We show that this…
Kim Louis, C. GrosDec 7, 2002
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Quantum size correction to the work function and the centroid of excess charge in positively ionized simple metal clusters
In this work, we have shown the important role of the finite-size correction to the work function in predicting the correct positions of the centroid of excess charge in positively charged simple…
M. PayamiDec 7, 2002
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Injection of a cold atomic beam into a magnetic guide
We report the continuous or pulsed loading of a slow and cold atomic beam into a magnetic guide. In order to optimize the transfer into the guide, we have studied two coupling schemes. The first one…
C. F. Roos, P. Cren, T. Lahaye et al.Dec 6, 2002
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Force and impulse from an Aharonov-Bohm flux line
We calculate the force and impulse operators for a charged particle in the field of an Aharonov-Bohm flux line. The force operator is formally the Lorentz force, with the magnetic field operator…
J. P. Keating, J. M. RobbinsDec 6, 2002
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Dynamics of entanglement between quantum dot spin-qubits
We briefly review the physics of gate operations between quantum dot spin-qubits and analyze the dynamics of quantum entanglement in such processes. The indistinguishable character of the electrons…
John Schliemann, Daniel LossDec 6, 2002
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Nuclear Spin Superradiance
The review of experimental and main theoretical works on the phenomenon of nuclear spin superradiance is given. The content includes: 1. Introduction, 2. Experimental Observation, 3. Basic Model, 4.…
V. I. YukalovDec 6, 2002
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Phenomenological theory of spinor Bose-Einstein condensates
A phenomenological model is proposed to describe the behavior of spinor Bose-Einstein condensates. In the absence of hyperfine spin-spin interactions, Bose-Einstein condensation leads to a…
Qiang GuDec 5, 2002
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Active suppression of dephasing in Josephson-junction qubits
Simple majority code correcting k dephasing errors by encoding a qubit of information into 2k+1 physical qubits is studied quantitatively. We derive an equation for quasicontinuous evolution of…
Dmitri V. Averin, Rosario FazioDec 5, 2002
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