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Condensed Matter papers — page 208

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Triangular Antiferromagnets
In this article we review the effects of magnetic frustation in the stacked triangular lattice. Frustration increases the degeneracy of the ground state, giving rise to different physics. In…
M. F. Collins, O. A. PetrenkoJun 15, 1997
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Baryon Asymmetry of Universe: View from Superfluid 3He
The origin of the excess of matter over antimatter in our Universe remains one of the fundamental problems. The dynamical baryogenesis in the process of the broken symmetry electroweak transition in…
G. E. VolovikJun 14, 1997
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Aspects of Dielectric Breakdown in a Model for Disordered Nonlinear Composites
We study dielectric breakdown in a semi-classical bond percolation model for nonlinear composite materials introduced by us and the related breakdown exponent near the percolation threshold in two…
Abhijit Kar Gupta, Asok K. SenJun 14, 1997
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Integrable su(3) spin chain combining different representations
The general expression for the local matrix t(θ) of a quantum chain with the site space in any representation of su(3) is obtained. This is made by generalizing t(θ) from the fundamental…
J. Abad, M. RíosJun 13, 1997
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Electrical Conduction in Nonlinear Composites
Study of various interesting features related to the nonlinear electrical response in composite materials through a model bond percolative system.
Abhijit Kar Gupta, Asok K. SenJun 12, 1997
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Comment on `Formation of a Dodecagonal Quasicrystalline Phase in a Simple Monatomic Liquid'
In a recent paper M. Dzugutov, Phys. Rev. Lett. 70 2924 (1993), describes a molecular dynamics cooling simulation where he obtained a large monatomic dodecagonal quasicrystal from a melt. The…
J. RothJun 12, 1997
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Random tiling quasicrystals in three dimensions
Three-dimensional icosahedral random tilings with rhombohedral cells are studied in the semi-entropic model. We introduce a global energy measure defined by the variance of the quasilattice points in…
W. Ebinger, J. Roth, H. -R. TrebinJun 12, 1997
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Random Tiling Transition in Three Dimensions
Three-dimensional icosahedral random tilings are studied in the semi-entropic model. We introduce a global energy measure defined by the variance of the quasilattice points in orthogonal space. The…
W. Ebinger, J. Roth, H. -R. TrebinJun 12, 1997
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Icosahedral coincidence rotations
The coincidence problem for three-dimensional discrete structures with icosahedral symmetry is reinvestigated. We present a parametric description of the coincidence rotations based on special…
Johannes Roth, Reinhard LückJun 12, 1997
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Relaxation process in a regime of quantum chaos
We show that the quantum relaxation process in a classically chaotic open dynamical system is characterized by a quantum relaxation time scale tq. This scale is much shorter than the Heisenberg time…
Giulio Casati, Giulio Maspero, Dima L. ShepelyanskyJun 11, 1997
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Generalized CP1 model from t1-t2-J model
A long-wavelength, low-frequency effective theory is obtained from t1-t2-J model. The action is written in terms of two-component bose spinor fields (CP1 fields) and two spinless Fermi fields.…
Naoum KarchevJun 11, 1997
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Dualities in Spin Ladders
We introduce a set of discrete modular transformations T,U and S in order to study the relationships between the different phases of the Heisenberg ladders obtained with all…
German Sierra, Miguel A. Martin-DelgadoJun 11, 1997
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Interface dynamics at the depinning transition
We study the local scaling properties of driven interfaces in disordered media modeled by the Edwards-Wilkinson equation with quenched noise. We find that, due to the super-rough character of the…
Juan M. Lopez, Miguel A. RodriguezJun 11, 1997
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Pair Correlations in Superfluid Helium 3
In 1996 Lee, Osheroff and Richardson received the Nobel Prize for their 1971 discovery of superfluid helium 3 -- a discovery which opened the door to the most fascinating system known in condensed…
D. VollhardtJun 11, 1997
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Simultaneous Brownian Motion of N Particles in a Temperature Gradient
A system of N Brownian particles suspended in a nonuniform heat bath is treated as a thermodynamic system whith internal degrees of freedom, in this case their velocities and coordinates. Applying…
J. M. Rubí, P. MazurJun 9, 1997
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Tight-Binding study of the electronic and magnetic properties of an L10 ordered FeCu alloy
We have calculated the electronic structure of the tetragonal L10 ordered FeCu by solving self-consistently a tight-binding Hamiltonian for s, p and d electrons. We have found by total energy…
Daniel ErrandoneaJun 7, 1997
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Spin-Peierls Dimerization of a s=1/2 Heisenberg Antiferromagnet on Square Lattice
Dimerization of a spin-half Heisenberg antiferromagnet on a square lattice is investigated by taking unexpanded exchange couplings. Several dimerized configurations are considered some of which are…
Aiman Al-Omari, A. H. NayyarJun 6, 1997
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Dynamics of viscous amphiphilic films supported by elastic solid substrates
The dynamics of amphiphilic films deposited on a solid surface is analyzed for the case when shear oscillations of the solid surface are excited. The two cases of surface- and bulk shear waves are…
M. V. Voinova, M. Jonson, B. KasemoJun 6, 1997
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Emergence of quantum chaos in finite interacting Fermi systems
We study the level spacing statistics P(s) in many-body Fermi systems and determine a critical two-body interaction strength Uc at which a crossover from Poisson to Wigner-Dyson statistics takes…
Ph. Jacquod, D. L. ShepelyanskyJun 5, 1997
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Monte Carlo Simulation of Magnetization Reversal in Fe Sesquilayers on W(110)
Iron sesquilayers grown at room temperature on W(110) exhibit a pronounced coercivity maximum near a coverage of 1.5 atomic monolayers. On lattices which faithfully reproduce the morphology of the…
M. Kolesik, M. A. Novotny, P. A. RikvoldJun 4, 1997
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Slow modes in passive advection
The anomalous scaling in the Kraichnan model of advection of the passive scalar by a random velocity field with non-smooth spatial behavior is traced down to the presence of slow resonance-type…
Denis Bernard, Krzysztof Gawedzki, Antti KupiainenJun 4, 1997
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Functional Integral approach to quasi-particles in Fermi Liquid theory
In this paper we propose a new way of organizing many-body perturbation theory in the Path-integral formulation where a set of quasi-particle wave-functionals ψ's are introduced and are…
Tai-Kai NgJun 4, 1997
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Nanoscale Field-Effect Transistors: An Ultimate Size Analysis
We have used a simple, analytically solvable model to analyze the characteristic s of dual-gate metal-oxide-semiconductor field-effect transistors (MOSFETs) with 10-nm-scale channel length L. The…
F. G. Pikus, K. K. LikharevJun 3, 1997
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Conductance of a Finite Quantum Wire Connected to Reservoirs
We study a finite quantum wire connected to external leads, and show that the conductance of the system significantly depends upon the length of the quantum wire and the position of the impurity in…
Yu-Liang LiuJun 3, 1997
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Low-temperature behavior of a Magnetic Impurity in a Heisenberg Chain
Using the bosonization technique, we have studied a spin-1/2 magnetic impurity in Heisenberg chain, and shown that the impurity specific heat and spin susceptibility have an anomalous temperature…
Yu-Liang LiuJun 3, 1997
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