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Condensed Matter papers — page 269

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Periodic Orbit Theory of the Transition to Chaos in Quantum Wells
An analytic theory is developed for the density of states oscillations in quantum wells in a magnetic field which is tilted with respect to the barrier planes. The main oscillations are found to come…
E. E. Narimanov, A. D. StoneApr 22, 1996
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Phase diagram and hidden order for generalized spin ladders
We investigate the phase diagram of antiferromagnetic spin ladders with additional exchange interactions on diagonal bonds by variational and numerical methods. These generalized spin ladders…
S. Brehmer, H. -J. Mikeska, U. NeugebauerApr 22, 1996
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Ground State Wave Function of the Schrödinger Equation in a Time-Periodic Potential
Using a generalized transfer matrix method we exactly solve the Schrödinger equation in a time periodic potential, with discretized Euclidean space-time. The ground state wave function propagates in…
Stefano Galluccio, Yi-Cheng ZhangApr 22, 1996
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Charge transfer excitons in optical absorption spectra of C60-dimers and polymers
Charge-transfer (CT) exciton effects are investigated for the optical absorption spectra of crosslinked C60 systems by using the intermediate exciton theory. We consider the C60-dimers, and the two…
Kikuo HarigayaApr 22, 1996
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Spectral statistics near the quantum percolation threshold
The statistical properties of spectra of a three-dimensional quantum bond percolation system is studied in the vicinity of the metal insulator transition. In order to avoid the influence of small…
Richard Berkovits, Yshai AvishaiApr 21, 1996
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Complexity, Tunneling and Geometrical Symmetry
It is demonstrated in the context of the simple one-dimensional example of a barrier in an infinite well, that highly complex behavior of the time evolution of a wave function is associated with the…
L. P. Horwitz, J. Levitan, Y. AshkenazyApr 21, 1996
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Spin Fluctuations in Magnetically Coupled Bi-layer Cuprates
We propose a possible mechanism of pseudo spin gap anomaly(PSGA) in magnetically coupled bi-layer cuprates without any fermion pairing instability. In our proposal PSGA does not necessarily require…
Junichiro KishineApr 20, 1996
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Spin Gaps in a Frustrated Heisenberg model for CaV4O9
I report results of a density matrix renormalization group (DMRG) study of a model for the two dimensional spin-gapped system CaV4O9. This study represents the first time that DMRG has been…
Steven R. WhiteApr 20, 1996
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Spontaneous Coherence and Collective Modes in Double-Layer Quantum Dot Systems
We study the ground state and the collective excitations of parabolically-confined double-layer quantum dot systems in a strong magnetic field. We identify parameter regimes where electrons form…
Jun Hu, E. Dagotto, A. H. MacDonaldApr 19, 1996
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Coarsening Dynamics of a One-Dimensional Driven Cahn-Hilliard System
We study the one-dimensional Cahn-Hilliard equation with an additional driving term representing, say, the effect of gravity. We find that the driving field E has an asymmetric effect on the…
C. L. Emmott, A. J. BrayApr 19, 1996
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Linear-response theory and lattice dynamics: a muffin-tin orbital approach
A detailed description of a method for calculating static linear-response functions in the problem of lattice dynamics is presented. The method is based on density functional theory and it uses…
S. Y. SavrasovApr 19, 1996
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Electron-phonon interactions and related physical properties of metals from linear-response theory
Spectral distribution functions of electron-phonon interaction α2F(ω) obtained by ab initio linear--response calculations are used to describe various superconducting and transport properties in a…
S. Y. Savrasov, D. Y. SavrasovApr 19, 1996
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Apparent Fractality Emerging from Models of Random Distributions
The fractal properties of models of randomly placed n-dimensional spheres (n=1,2,3) are studied using standard techniques for calculating fractal dimensions in empirical data (the box counting…
Daniel A. Hamburger, Ofer Biham, David AvnirApr 19, 1996
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The Error Function and The Kink Soliton
We provide analytical functions approximating ∫ e-x2 dx, the basis of which is the kink soliton and which are both accurate (error < 0.2 %) and simple. We demonstrate our results with some…
B. A. BassettApr 18, 1996
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The Universal Composite Fermion Hall Conductance at ν=1/2
We show that at electronic filling factor ν=1/2, the lowest Landau level constraint implies that at any temperature, and in the presence of any amount of particle-hole symmetric disorder, the…
D-H Lee, Yu. A. Krotov, J. Gan et al.Apr 18, 1996
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Luttinger liquids coupled by hopping
The stability of the Luttinger liquid to small transverse hopping has been studied from several points of view. The renormalization group approach in particular has been criticized because it does…
Daniel Boies, Claude Bourbonnais, A. -M. S. TremblayApr 18, 1996
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Ferromagnetism in an itinerant electron system: Hubbard model on complete graph
In this work, the ground states of the Hubbard model on complete graph are studied, for a finite lattice size L and arbitrary on-site energy U. We construct explicitly the ground states of the…
D. F. WangApr 18, 1996
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Bogomolnyi-type bounds in unconventional superconductors without external magnetic fields
Following Bogomolnyi's classical treatment of vortices, we develop a method for finding rigorous lower bounds to the Landau-Ginzburg free energy describing unconventional superconductors in the…
Ana Achucarro, Juan L. ManesApr 18, 1996
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Elastic Theory Has Zero Radius of Convergence
Nonlinear elastic theory studies the elastic constants of a material (such as Young's modulus or bulk modulus) as a power series in the applied load. The inverse bulk modulus K, for example…
Alex Buchel, James P. SethnaApr 18, 1996
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Aperiodic Ising Models
We consider several aspects of non-periodic Ising models in one and two dimensions. Here we are not interested in random systems, but rather in models with intrinsic long-range aperiodic order. The…
Uwe Grimm, Michael BaakeApr 18, 1996
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Dynamical Mean Field Theory for Perovskites
Using the Hubbard Hamiltonian for transition metal-3d and oxygen-2p states with perovskite geometry, we present a dynamical mean field theory which becomes exactin the limit of large coordination…
P. Lombardo, J. Schmalian, M. Avignon et al.Apr 17, 1996
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Chain length dependence of the polymer-solvent critical point parameters
We report grand canonical Monte Carlo simulations of the critical point properties of homopolymers within the Bond Fluctuation model. By employing Configurational Bias Monte Carlo methods, chain…
N. B. Wilding, M. Mueller, K. BinderApr 17, 1996
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Cluster Dynamics for Randomly Frustrated Systems with Finite Connectivity
In simulations of some infinite range spin glass systems with finite connectivity, it is found that for any resonable computational time, the saturatedenergy per spin that is achieved by a cluster…
N. Persky, I. Kanter, S. SolomonApr 17, 1996
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Vortex lines in the three-dimensional XY model with random phase shifts
The stability of the ordered phase of the three-dimensional XY-model with random phase shifts is studied by considering the roughening of a single stretched vortex line due to the disorder. It is…
M. S. Li, T. Nattermann, H. Rieger et al.Apr 17, 1996
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Growth in systems of vesicles and membranes
We present a theoretical study for the intermediate stages of the growth of membranes and vesicles in supersaturated solutions of amphiphilic molecules. The problem presents important differences…
A. M. Somoza, U. Marini Bettolo Marconi, P. TarazonaApr 17, 1996
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