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Condensed Matter papers — page 173

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Wigner crystallization and metal-insulator transition of two-dimensional holes in GaAs/AlGaAs at B=0
We report the transport properties of a low disorder two-dimensional hole system (2DHS) in the GaAs/AlGaAs heterostructure, which has an unprecedentedly high peak mobility of 7× 105cm2/Vs,…
Jongsoo Yoon, C. C. Li, D. Shahar et al.Jul 16, 1998
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Quantum phase transitions in the Triangular-lattice Bilayer Heisenberg Model
We study the triangular lattice bilayer Heisenberg model with antiferromagnetic interplane coupling J and nearest neighbour intraplane coupling J= λJ, which can be ferro- or…
Rajiv R. P. singh, Norbert ElstnerJul 16, 1998
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Hall Conductivity in the presence of repulsive magnetic impurities
The Hall conductivity of disordered magnetic systems consisting of hard-core point vortices randomly dropped on the plane with a Poissonian distribution, has a behavior analogous to the one observed…
Jean Desbois, Stéphane Ouvry, Christophe TexierJul 16, 1998
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Simulation of Lattice Polymers with Multi-Self-Overlap Ensemble
A novel family of dynamical Monte Carlo algorithms for lattice polymers is proposed. Our central idea is to simulate an extended ensemble in which the self-avoiding condition is systematically…
Yukito Iba, George Chikenji, Macoto KikuchiJul 16, 1998
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Field Theory of Skyrme Lattices in Quantum Hall Ferromagnets
We report the application of the nonlinear σ model to study the multi-skyrmion problem in the quantum Hall ferromagnet system. We make use of a first-principle calculation to derive an analytical…
M. Abolfath, M. R. EjtehadiJul 16, 1998
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Crossover from Weak- to Strong-Coupling Superconductivity and to Normal State with Pseudogap
For an electron gas with a δ-function attraction we investigate the crossover from weak-coupling to strong-coupling superconductivity as well as normal state near the temperature T*, at which…
E. Babaev, H. KleinertJul 16, 1998
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Thermoelectric Figure of Merit of Strongly Correlated Superlattice Semiconductors
We solved the Anderson Lattice Hamiltonian to get the energy bands of a strongly correlated semiconductor by using slave boson mean field theory. The transport properties were calculated in the…
Wenjin Mao, Kevin S. BedellJul 15, 1998
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Thermal properties of slow dynamics
The limit of small entropy production is reached in relaxing systems long after preparation, and in stationary driven systems in the limit of small driving power. Surprisingly, for extended systems…
Leticia F. Cugliandolo, Jorge KurchanJul 15, 1998
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Applications of Temperley-Lieb algebras to Lorentz lattice gases
Motived by the study of motion in a random environment we introduce and investigate a variant of the Temperley-Lieb algebra. This algebra is very rich, providing us three classes of solutions of the…
M. J. Martins, B. NienhuisJul 15, 1998
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Non-adiabatic scattering of a classical particle in an inhomogeneous magnetic field
We study the violation of the adiabaticity of the electron dynamics in a slowly varying magnetic field. We formulate and solve exactly a non-adiabatic scattering problem. In particular, we consider…
F. Evers, A. D. Mirlin, D. G. Polyakov et al.Jul 14, 1998
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Temperature dependent surface relaxations of Ag(111)
The temperature dependent surface relaxation of Ag(111) is calculated by density-functional theory. At a given temperature, the equilibrium geometry is determined by minimizing the Helmholtz free…
Jianjun Xie, Stefano de Gironcoli, Stefano Baroni et al.Jul 14, 1998
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Deep Level Promotion Mechanism in Sputtering
We have applied a double decoupled localized level Anderson-Newns Hamiltonian to the analysis of surface effects upon the ionized fraction R+ of sputtered atoms from a metal surface.…
Antonio Sindona, Giovanni FalconeJul 13, 1998
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Staggered-spin contribution to nuclear spin-lattice relaxation in two-leg antiferromagnetic spin-1/2 ladders
We study the nuclear spin-lattice relaxation rate 1/T1 in the two-leg antiferromagnetic spin-1/2 Heisenberg ladder. More specifically, we consider the contribution to 1/T1 from the processes…
D. A. Ivanov, Patrick A. LeeJul 13, 1998
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Thermodynamics of the one-dimensional SU(4) symmetric spin-orbital model
The ground state properties and the thermodynamics of the one-dimensional SU(4) symmetric spin system with orbital degeneracy are investigated using the quantum Monte Carlo loop algorithm. The…
Beat Frischmuth, Frederic Mila, Matthias TroyerJul 13, 1998
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Theory of Coupled Phase Transitions: Phase Separation and Variation of Order Parameter
A simplified Ginzburg-Landau theory is presented to study generally a coupling of a first-order phase transition (FOPT) to a second-order phase transition (SOPT). We show analytically that, due to…
Fan ZhongJul 13, 1998
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The two electron artificial molecule
Exact results for the classical and quantum system of two vertically coupled two-dimensional single electron quantum dots are obtained as a function of the interatomic distance (d) and with…
B. Partoens, A. Matulis, F. M. PeetersJul 12, 1998
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Path integral Monte Carlo simulation of the second layer of helium-4 adsorbed on graphite
We have developed a path integral Monte Carlo method for simulating helium films and apply it to the second layer of helium adsorbed on graphite. We use helium-helium and helium-graphite interactions…
Marlon Pierce, Efstratios ManousakisJul 10, 1998
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Nonlinear nonlocal diffusion of magnetic flux in thin type-II superconductors and Josephson junction arrays: Exact solutions
An exact solution of the nonlinear nonlocal diffusion problem is obtained that describes the evolution of the magnetic flux injected into a soft or hard type-II superconductor film or a…
S. N. DorogovtsevJul 10, 1998
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A reexamination of quenches in Helium 4 and Helium 3
In the light of recent difficulties in observing vortices in quenches of liquid helium 4 to its superfluid state we re-examine the Zurek scenario for their production. We argue that experiments in…
G. Karra, R. J. RiversJul 10, 1998
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Large Orders for Self-Avoiding Membranes
We derive the large order behavior of the perturbative expansion for the continuous model of tethered self-avoiding membranes. It is controlled by a classical configuration for an effective potential…
Francois David, Kay Joerg WieseJul 10, 1998
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Mesoscopic description of the annealed Ising model and Multiplicative noise
A new type of Langevin equation exhibiting a non trivial phase transition associated with the presence of multiplicative noise is introduced. The equation is derived as a mesoscopic representation of…
Walter Genovese, Miguel A. Muñoz, P. L. GarridoJul 10, 1998
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Semiclassical eigenstates of four-sublattice antiferromagnets
Applying Bohr-Sommerfeld quantization and the topological phase of spin path integrals, one can determine the multiplicities, lattice symmetries, and eigenvalue clustering pattern of the low-lying…
Christopher L. Henley, Nai-Gong ZhangJul 9, 1998
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Quantum Poincaré Recurrences
We show that quantum effects modify the decay rate of Poincaré recurrences P(t) in classical chaotic systems with hierarchical structure of phase space. The exponent p of the algebraic decay P(t) ~…
Giulio Casati, Giulio Maspero, Dima L. ShepelyanskyJul 9, 1998
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Electronic Excitations and Stability of the Ground State of C60 Molecules
A model study of the singlet excitons in the C60 molecule with emphasis on the Coulomb interaction between excited electron and hole leads to a physical understanding of the interaction effects on…
F. Bechstedt, M. Fiedler, L. J. ShamJul 9, 1998
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Real-time non-equilibrium dynamics of quantum glassy systems
We develop a systematic analytic approach to aging effects in quantum disordered systems in contact with an environment. Within the closed-time path-integral formalism we include dissipation by…
Leticia F. Cugliandolo, Gustavo LozanoJul 9, 1998
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