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Condensed Matter papers — page 96

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Spin Environment Engineering for a Persistent Current Qubit
A persistent current qubit has two quantum states with opposite currents flowing in a superconducting loop. Their magnetic field couple to nuclear spins. The qubit state is not only perturbed by the…
Jacek DziarmagaJan 30, 2001
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Epitaxial growth of Cu on Cu(001): experiments and simulations
A quantitative comparison between experimental and Monte Carlo simulation results for the epitaxial growth of Cu/Cu(001) in the submonolayer regime is presented. The simulations take into account a…
Itay Furman, Ofer Biham, Jiang-Kai Zuo et al.Jan 30, 2001
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Complex diffusion Monte-Carlo method: test by the simulation of the 2D fermions
On the base of the diffusion Monte-Carlo method we develop the method allowing to simulate the quantum systems with complex wave function. The method is exact and there are no approximations on the…
B. Abdullaev, M. Musakhanov, A. NakamuraJan 30, 2001
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Singularity Formation and Collapse in the Attractive Gross-Pitaevskii Equation
A generic mechanism of collapse in the Gross-Pitaevskii equation with attractive interparticle interactions is gained by reformulating this equation as Newton's equation of motion for a system of…
A. V. Rybin, G. G. Varzugin, J. TimonenJan 30, 2001
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Nanoscale anisotropic structural correlations in the paramagnetic and ferromagnetic phases of Nd0.5Sr0.5 MnO3
We report x-ray scattering studies of short-range structural correlations and diffuse scattering in Nd0.5Sr0.5MnO3. On cooling, this material undergoes a series of transitions, first from a…
V. Kiryukhin, B. G. Kim, T. Katsufuji et al.Jan 29, 2001
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Zigzag theory of localization in quantum chaos
This paper has been withdrawn by the author, due a crucial error in Eq. 6.
Daniel L. MillerJan 27, 2001
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Analytic Conditions for Targeted Energy Transfer between Nonlinear Oscillators or Discrete Breathers
It is well known that any amount of energy injected in a harmonic oscillator which is resonant and weakly coupled with a second harmonic oscillator, tunnels back and forth between these two…
S. Aubry, G. Kopidakis, A. M. Morgante et al.Jan 26, 2001
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Soliton-limited Superflow in 3He-A between Parallel Plates
We have studied theoretically the flow of superfluid 3He-A in parallel-plate geometry. The equilibrium order-parameter texture is calculated numerically in two spatial dimensions consisting of the…
J. Kopu, E. V. ThunebergJan 26, 2001
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Two leg quantum Ising ladder: A bosonization study of the ANNNI model
The quantum ANNNI chain in a transverse field is investigated by means of the bosonization approach in the limit of large next-nearest neighbor interaction. In this regime, this model can be viewed…
Dave Allen, Patrick Azaria, Philippe LecheminantJan 26, 2001
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Multi-mode dynamics of a coupled ultracold atomic-molecular system
We analyze the coherent multi-mode dynamics of a system of coupled atomic and molecular Bose gases. Starting from an atomic Bose-Einstein condensate with a small thermal component, we observe a…
K. Goral, M. Gajda, K. RzazewskiJan 26, 2001
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Efficient Behavior of Small-World Networks
We introduce the concept of efficiency of a network, measuring how efficiently it exchanges information. By using this simple measure small-world networks are seen as systems that are both globally…
Vito Latora, Massimo MarchioriJan 25, 2001
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Specific heat of a Fermi system near ferromagnetic quantum phase transition
We calculate the specific heat for an interacting Fermi system near the ferromagnetic phase transition using the Renormalization Group method. The temperature dependence of the specific heat present…
I. Grosu, D. Bodea, M. CrisanJan 25, 2001
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Renormalization - group analysis of dilute Bose system in d - dimension at finite temperature
We study the d - dimensional Bose gas at finite temperature using the renormalization group method. The flow - equations and the free energy have been obtained for dimension d, and the cases d<2 and…
M. Crisan, D. Bodea, I. Grosu et al.Jan 25, 2001
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Theory of the anomalous Hall effect from the Kubo formula and the Dirac equation
A model to treat the anomalous Hall effect is developed. Based on the Kubo formalism and on the Dirac equation, this model allows the simultaneous calculation of the skew-scattering and side-jump…
A. Crépieux, P. BrunoJan 24, 2001
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Effects of dipolar field in the spin dynamics of a Fermi liquid
We study spin dynamics of a normal Fermi liquid taking into account the demagnetizing field produced by the spin system itself. Linear solutions of the spin dynamics equations in the form of standing…
P. L. Krotkov, V. P. Mineev, G. A. VermeulenJan 24, 2001
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Backscattering enhancement of an electromagnetic wave scattered by two-dimensional rough layers
The problem of an electromagnetic wave scattering by a slab with two rough boundaries is solved by a small-perturbation method under the Rayleigh hypothesis. In order to obtain a perturbative…
A. Soubret, G. Berginc, C. BourrelyJan 24, 2001
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Monte Carlo study of the superfluid weight in doped antiferromagnets
The phase fluctuations of the condensate in doped antiferromagnets, described by a t-t'-J model and a suitable 1/N expansion, provide a mechanism for a Kosterlitz-Thouless (KT) type of transition…
Gregory C. PsaltakisJan 23, 2001
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Two-Stage Rotational Disordering of a Molecular Crystal Surface: C60
We propose a two-stage mechanism for the rotational surface disordering phase transition of a molecular crystal, as realized in C60 fullerite. Our study, based on Monte Carlo simulations,…
C. Laforge, D. Passerone, A. B. Harris et al.Jan 23, 2001
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Complex Diffusion Monte-Carlo method for the systems with complex wave function: test by the simulation of 2D electron in uniform magnetic field
On the base of Diffusion Monte-Carlo method it is developed a new Complex Diffusion Monte-Carlo (CDMC) method allowing to simulate the quantum systems with complex wave function. There are no…
B. Abdullaev, M. Musakhanov, A. NakamuraJan 22, 2001
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Ghost excitonic insulator transition in layered graphite
Some unusual properties of layered graphite, including a linear energy dependence of the quasiparticle damping and weak ferromagnetism at low doping, are explained as a result of the proximity of a…
D. V. KhveshchenkoJan 19, 2001
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Vortex Dynamics in the Two-Fluid Model
We have used two-fluid dynamics to study the discrepancy between the work of Thouless, Ao and Niu (TAN) and that of Iordanskii. In TAN no transverse force on a vortex due to normal fluid flow was…
D. J. Thouless, M. R. Geller, W. F. Vinen et al.Jan 19, 2001
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Collective Excitations of a "Gravitationally" Self-Bound Bose Gas
We investigate the collective excitations of an atomic Bose-Einstein condensate in the self-binding regime produced by electromagnetically induced ``gravity'' (1/r attraction). Analytical…
S. Giovanazzi, G. Kurizki, I. E. Mazets et al.Jan 19, 2001
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Bose-Einstein condensation and superfluidity in trapped atomic gases
Bose-Einstein condensates confined in traps exhibit unique features which have been the object of extensive experimental and theoretical studies in the last few years. In this paper I will discuss…
Sandro StringariJan 19, 2001
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Semiclassical theory of trapped fermionic dipoles
We investigate the properties of a degenerate dilute gas of neutral fermionic particles in a harmonic trap that interact via dipole-dipole forces. We employ the semiclassical Thomas-Fermi method and…
K. Goral, Berthold-Georg Englert, K. RzazewskiJan 19, 2001
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Modeling the electronic behavior of γ-LiV2O5: a microscopic study
We determine the electronic structure of the one-dimensional spin-1/2 Heisenberg compound γ-LiV2O5, which has two inequivalent vanadium ions, V(1) and V(2), via density-functional…
R. Valenti, T. Saha-Dasgupta, J. V. Alvarez et al.Jan 18, 2001
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