Numerical simulations of scattering speckle from phase ordering systemsThe scattering of coherent X-rays from dynamically evolving systems is currently becoming experimentally feasible. The scattered beam produces a pattern of bright and dark speckles, which fluctuate…Gregory Brown, Per Arne Rikvold, Martin Grant·Jun 20, 1996SaveLearn
Fractal Conductance Fluctuations in Gold--NanowiresA detailed analysis of magneto-conductance fluctuations of quasiballistic gold-nanowires of various lengths is presented. We find that the variance <(ΔG)2> = < (G(B)-G(B+ΔB))2> when analyzed for…Helmut Hegger, Klaus Hecker, Gernot Reckziegel et al.·Jun 20, 1996SaveLearn
Earthquake statistics and fractal faultsWe introduce a Self-affine Asperity Model (SAM) for the seismicity that mimics the fault friction by means of two fractional Brownian profiles (fBm) that slide one over the other. An earthquake…R. Hallgass, V. Loreto, O. Mazzella et al.·Jun 20, 1996SaveLearn
Probabilistic Fragmentation and Effective Power LawA simple fragmentation model is introduced and analysed. We show that, under very general conditions, an effective power law for the mass distribution arises with realistic exponent. This exponent…M. Marsili, Y. -C. Zhang·Jun 20, 1996SaveLearn
Low Temperature Magnetic Properties of the Double Exchange ModelWe study the ferromagnetic (FM) Kondo lattice model in the strong coupling limit (double exchange (DE) model). The DE mechanism proposed by Zener to explain ferromagnetism has unexpected…Jun Zang, H. Röder, A. R. Bishop et al.·Jun 20, 1996SaveLearn
Disclination Asymmetry in Two-Dimensional Nematic Liquid Crystals with Unequal Frank ConstantsThe behavior of a thin film of nematic liquid crystal with unequal Frank constants is discussed. Distinct Frank constants are found to imply unequal core energies for +1/2 and -1/2 disclinations.…Michael W. Deem·Jun 19, 1996SaveLearn
Influence of a magnetic field on the antiferromagnetic order in UPt3A neutron diffraction experiment was performed to investigate the effect of a magnetic field on the antiferromagnetic order in the heavy fermion superconductor UPt3. Our results show that a field in…B. Lussier, L. Taillefer, W. J. L. Buyers et al.·Jun 19, 1996SaveLearn
The Magnetization of Cu2(C5H12N2)2Cl4 : A Heisenberg Spin Ladder SystemWe study the magnetization of a Heisenberg spin ladder using exact diagonalization techniques, finding three distinct magnetic phases. We consider the results in relation to the experimental…C. A. Hayward, D. Poilblanc, L. P. Lévy·Jun 19, 1996SaveLearn
Photoemission Spectra in t-J Ladders with Two LegsPhotoemission spectra for the isotropic two-leg t-J ladder are calculated at various hole-doping levels using exact diagonalization techniques. Low-energy sharp features caused by short-range…Stephan Haas, Elbio Dagotto·Jun 19, 1996SaveLearn
Detection of pairing correlation in the two-dimensional Hubbard modelQuantum Monte Carlo method is used to re-examine superconductivity in the single-band Hubbard model in two dimensions. Instead of the conventional pairing, we consider a `correlated pairing',…Kazuhiko Kuroki, Hideo Aoki, Takashi Hotta et al.·Jun 19, 1996SaveLearn
Gutzwiller wave function under magnetic fieldMagnetization process of the Gutzwiller wave function is studied accurately by a variational Monte Carlo method. We apply it to the one-dimensional (1D) and 2D Hubbard models (HM), and to the 1D…Hisatoshi Yokoyma, Shinya Tokizaki·Jun 19, 1996SaveLearn
Electronic structure of the valence band of II--VI wide band gap semiconductor interfacesIn this work we present the electronic band structure for (001)--CdTe interfaces with some other II--VI zinc blende semiconductors. We assume ideal interfaces. We use tight binding Hamiltonians with…D. Olguin, R. Baquero·Jun 19, 1996SaveLearn
Survival and Nonescape Probabilities for Resonant and Nonresonant DecayIn this paper we study the time evolution of the decay process for a particle confined initially in a finite region of space, extending our analysis given recently (Phys. Rev. Lett. 74, 337 (1995)).…G. Garcia-Calderon, J. L. Mateos, M. Moshinsky·Jun 19, 1996SaveLearn
Density dependence of the electronic supershells in the homogeneous jellium modelWe present the results of self-consistent calculations of the electronic shell and supershell structure for clusters having up to 6000 valence electrons. The ionic background is described in terms of…Erik Koch, Olle Gunnarsson·Jun 18, 1996SaveLearn
The Neutron Peak in the Interlayer Tunneling Model of High Temperature SuperconductorsRecent neutron scattering experiments in YBCO exhibit an unusual magnetic peak that appears only below the superconducting transition temperature. The experimental observations are explained within…L. Yin, S. Chakravarty, P. W. Anderson·Jun 18, 1996SaveLearn
The free energy singularity of the asymmetric 6--vertex model and the excitations of the asymmetric XXZ chainWe consider the asymmetric six--vertex model, i.e. the symmetric six--vertex model in an external field with both horizontal and vertical components, and the relevant asymmetric XXZ chain.…Giuseppe Albertini, Silvio Renato Dahmen, Birgit Wehefritz·Jun 18, 1996SaveLearn
Cooperativity of Protein Folding and the Random-Field Ising ModelThe relation between cooperativity of protein folding and the Random-Field Ising Model (RFIM) is established. Generalization of the Imry-Ma argument predicts cooperative folding transition for small…A. M. Gutin, V. I. Abkevich, E. I. Shakhnovich·Jun 18, 1996SaveLearn
Collective Spin Modes in Superconducting Double LayersWe investigate a double layer system with tight-binding hopping, intra-layer and inter-layer interactions, as well as a Josephson like coupling. We find that an antiferromagnetic spin polarization…Christian Helm, Franz Forsthofer, Joachim Keller·Jun 18, 1996SaveLearn
Investigation of the Ising-type models within cluster approachThe method for calculation of the correlation functions of the Ising-type systems with short-range interaction and with arbitrary value of spin is developed within cluster approximation. For the…R. R. Levitskii, S. I. Sorokov·Jun 18, 1996SaveLearn
Relaxation dynamics of disordered Ising model. Two-site cluster approximationSpin relaxation in a site-disordered Ising model within master equation approach is studied. The q,ω-dependent susceptibility of the model is calculated and investigated. Effects described by…R. R. Levitskii, S. I. Sorokov, R. O. Sokolovskii·Jun 18, 1996SaveLearn
Correlation functions of quenched and annealed Ising systemsSpin correlation functions (up to the 3-site one) of disordered Ising model with the nearest neighbour interaction are calculated and investigated within a two-site cluster approximation for both…R. R. Levitskii, S. I. Sorokov·Jun 18, 1996SaveLearn
A Fermion-like description of condensed Bosons in a trapA Bose-Einstein condensate of atoms, trapped in an axially symmetric harmonic potential, is considered. By averaging the spatial density along the symmetry direction over a length that preserves the…R. K. Bhaduri, M. V. N. Murthy·Jun 18, 1996SaveLearn
Temporal Scaling of Interfaces Propagating in Porous MediaTo better understand the temporal behavior of a roughening meniscus driven by capillary forces during the imbibition of a viscous fluid in porous media, we measure the height-height autocorrelation…Viktor K. Horváth, H. Eugene Stanley·Jun 18, 1996SaveLearn
New universal spectral correlatorsWe study the universal properties of distributions of eigenvalues of random matrices in the large N limit. The distributions fall in universality classes characterized entirely by the support of…J. Ambjorn, G. Akemann·Jun 18, 1996SaveLearn
Partially Solvable Anisotropic t-J Model with Long-Range InteractionsA new anisotropic t-J model in one dimension is proposed which has long-range hopping and exchange. This t-J model is only partially solvable in contrast to known integrable models with long-range…Yasuhiro Saiga, Yusuke Kato, Yoshio Kuramoto·Jun 18, 1996SaveLearn