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Condensed Matter papers — page 218

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Comment on "Nonzero Fermi Level Density of States for a Disordered d-wave superconductor in 2D" by Ziegler et al. PRL 77, 3013 (1996)
In their paper Ziegler et al. claim that the model of 2D Dirac fermions in a random gauge potential has a finite density of states at zero energy. We point out that the approach used in this paper…
A. A. Nersesyan, A. M. TsvelikJan 25, 1997
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Two-level system with noise: Blue's function approach
By using the random matrix approach and generalized Blue's function representation we solve analytically the model of an effective two-level system coupled to a noise reservoir. We show that…
Ewa Gudowska-Nowak, Gabor Papp, Juergen BrickmannJan 25, 1997
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Second virial coefficient for real gases at high temperature
We study the second virial coefficient, B(T), for simple real gases at high temperature. Theoretical arguments imply that there exists a certain temperature, Ti, for each gas, for which this…
H. Boschi-Filho, C. C. ButhersJan 24, 1997
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Nonequilibrium phase transition in the kinetic Ising model: Divergences of fluctuations and responses near the transition point
The nonequilibrium dynamic phase transition, in the kinetic Ising model in presence of an oscillating magnetic field, has been studied by Monte Carlo simulation. The fluctuation of dynamic order…
Muktish AcharyyaJan 24, 1997
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Magnetic susceptibility of EuTe/PbTe Heisenberg superlattices: experimental and theoretical studies
We report results on the temperature dependence of the susceptibilities of a set of MBE-grown short-period EuTe/PbTe antiferromagnetic superlattices having different EuTe layer thicknesses. In-plane…
Lorenzo Bergomi, James J. ChenJan 23, 1997
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The Quantum Hall Effect of Field Induced Spin Density Wave Phases: the Physics of the Ultra Quantum Crystal
The Quantum Hall Effect of Field Induced Spin Density Wave Phases is accounted for within a weak coupling theory which assumes that in the relevant low temperature part of the phase diagram the quasi…
Pascal LedererJan 23, 1997
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Theory of a spherical quantum rotors model: low--temperature regime and finite-size scaling
The quantum rotors model can be regarded as an effective model for the low-temperature behavior of the quantum Heisenberg antiferromagnets. Here, we consider a d-dimensional model in the spherical…
Hassan Chamati, Ekaterina S. Pisanova, Nocholay S. TonchevJan 22, 1997
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Effects of Impurities in Random Sequential Adsorption on a One-Dimensional Substrate
We have solved the kinetics of random sequential adsorption of linear k-mers on a one-dimensional disordered substrate for the random sequential adsorption initial condition and for the random…
Jae Woo LeeJan 22, 1997
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Renormalization group of the Domany-Kinzel cellular automaton
We apply the dinamically driven renormalization group to study the critical properties of the Domany-Kinzel probabilistic cellular automaton. To preserve the absorbing state clusters with at least…
Tânia Tomé, Mário J. de OliveiraJan 22, 1997
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Self-Organized Criticality and Punctuated Equilibria
Many natural phenomena evolve intermittently, with periods of tranquillity interrupted by bursts of activity, rather than following a smooth gradual path. Examples include earthquakes, volcanic…
Per Bak, Stefan BoettcherJan 22, 1997
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Statistical mechanics and thermodynamics for multispecies exclusion statistics
Statistical mechanics and thermodynamics for ideal fractional exclusion statistics with mutual statistical interactions is studied systematically. We discuss properties of the single-state partition…
Serguei B. Isakov, Stefan MashkevichJan 21, 1997
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A Soluble Phase Field Model
The kinetics of an initially undercooled solid-liquid melt is studied by means of a generalized Phase Field model, which describes the dynamics of an ordering non-conserved field phi (e.g.…
Umberto Marini Bettolo Marconi, Andrea Crisanti, Giulia IoriJan 21, 1997
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Generalized deformed oscillator for vortices in superfluid films
The algebra of observables of a system of two identical vortices in a superfluid thin film is described as a generalized deformed oscillator with a structure function containing a linear (harmonic…
Dennis Bonatsos, C. DaskaloyannisJan 21, 1997
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Finite-Size Effects in Critical Phenomena from Mean Field Approach with ϕ4 Model
The finite-size effects in critical phenomena of a thin film system are studied from a mean field (MF) approach with ϕ4 model for second-order phase transition. The influence of boundary condition…
C. B. Yang, X. CaiJan 19, 1997
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Glauber Dynamics and Ageing
The Glauber dynamics of various models (REM-like trap models, Brownian motion, BM model, Ising chain and SK model) is analyzed in relation with the existence of ageing. From a finite size Glauber…
R. Mélin, P. ButaudJan 16, 1997
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On the Path Integral Representation for Spin Systems
We propose a classical constrained Hamiltonian theory for the spin. After the Dirac treatment we show that due to the existence of second class constraints the Dirac brackets of the proposed theory…
D. Cabra, A. Dobry, A. Greco et al.Jan 15, 1997
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Influence of Dislocations in Thomson's Problem
We investigate Thomson's problem of charges on a sphere as an example of a system with complex interactions. Assuming certain symmetries we can work with a larger number of charges than before.…
A. Perez-Garrido, M. J. W. Dodgson, M. A. MooreJan 14, 1997
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Lorentz-Lorenz shift in a Bose-Einstein condensate
We study the quantum field theory of light-matter interactions for quantum degenerate atomic gases at low light intensity. We argue that the contact interactions between atoms emerging in the dipole…
Janne Ruostekoski, Juha JavanainenJan 14, 1997
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Quantum field theory of cooperative atom response: Low light intensity
We study the interactions of a possibly dense and/or quantum degenerate gas with driving light. Both the atoms and the electromagnetic fields are represented by quantum fields throughout the…
Janne Ruostekoski, Juha JavanainenJan 14, 1997
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Metric tensor as the dynamical variable for variable cell-shape molecular dynamics
We propose a new variable cell-shape molecular dynamics algorithm where the dynamical variables associated with the cell are the six independent dot products between the vectors defining the cell…
Ivo Souza, Jose Luis MartinsJan 13, 1997
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Self-Organized Criticality Induced by Diversity
We have studied the collective behavior of a population of integrate-and-fire oscillators. We show that diversity, introduced in terms of a random distribution of natural periods, is the mechanism…
Alvaro Corral, Conrad J. Perez, Albert Diaz-GuileraJan 13, 1997
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A hierarchical scheme for cooperativity and folding in proteins
We propose a protein model based on a hierarchy of constraints that force the protein to follow certain pathways when changing conformation. The model exhibits a first order phase transition,…
Alex Hansen, Mogens H. Jensen, Kim Sneppen et al.Jan 10, 1997
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In-plane Magnetic Field Induced Kosterlitz-Thouless Type Metal Insulator Transition in Coupled Double Quantum Wells
We study the localization properties in coupled double quantum wells with an in-plane magnetic field. The localization length is directly calculated using a transfer matrix technique and finite size…
D. Z. Liu, X. C. XieJan 10, 1997
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Integrability and coherence of hopping between 1D correlated electron systems (Reply Comment)
The main point of Clarke and Strong's comment, namely that our results concerning the effect of integrability on the hopping of electrons between chains are probably not related to the notion of…
Frederic Mila, Didier PoilblancJan 9, 1997
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Transport in α-Sexithiophene Films
The field-effect mobility of hole polarons in α-sexithiophene, measured in thin film transistors, was shown to be well fitted by Holstein's small polaron theory. Unfortunately, Holstein's…
M. W. Wu, E. M. ConwellJan 8, 1997
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