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Condensed Matter papers — page 104

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Numerical analysis of the magnetic-field-tuned superconductor-insulator transition in two dimensions
Ground state of the two-dimensional hard-core-boson model subjected to external magnetic field and quenched random chemical potential is studied numerically. In experiments, magnetic-field-tuned…
Yoshihiro NishiyamaNov 1, 2000
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The Exact Solution of 1-D SU(n) Hubbard model
In this paper we derive out the exact solution of the SU(n) Hubbard model through the coordinate and the algebraic Bethe ansatz methods. The energy spectrum and the Bethe ansatz equations are…
Boyu Hou, Dantao Peng, Ruihong YueOct 31, 2000
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Does EELS haunt your photoemission measurements?
It has been argued in a recent paper by R. Joynt (R. Joynt, Science 284, p 777 (1999)) that in the case of poorly conducting solids the photoemission spectrum close to the Fermi Energy may be…
K. Schulte, M. A. James, P. G. Steeneken et al.Oct 30, 2000
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Theory of Ferromagnetism in Diluted Magnetic Semiconductors
Carrier-induced ferromagnetism has been observed in several (III,Mn)V semiconductors. We review the theoretical picture of these ferromagnetic semiconductors that emerges from a model with…
Jürgen König, Hsiu-Hau Lin, Allan H. MacDonaldOct 29, 2000
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Eliminating leading corrections to scaling in the 3-dimensional O(N)-symmetric phi4 model: N=3 and 4
We study corrections to scaling in the O(3)- and O(4)-symmetric phi4 model on the three-dimensional simple cubic lattice with nearest neighbour interactions. For this purpose, we use Monte Carlo…
Martin HasenbuschOct 28, 2000
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Muffin Tin Orbitals of Arbitrary Order
We have derived orbital basis sets from scattering theory. They are expressed as polynomial approximations to the energy dependence of a set of partial waves, in quantized form. The corresponding…
O. K. Andersen, T. Saha-DasguptaOct 27, 2000
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States without linear counterpart in Bose-Einstein condensates
We show the existence of stationary solutions of a 1-D Gross-Pitaevskii equation in presence of a multi-well external potential that do not reduce to any of the eigenfunctions of the associated…
Roberto D'Agosta, Carlo PresillaOct 27, 2000
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Negative differential resistance in nanotube devices
Carbon nanotube junctions are predicted to exhibit negative differential resistance, with very high peak-to-valley current ratios even at room temperature. We treat both nanotube p-n junctions and…
F. Leonard, J. TersoffOct 27, 2000
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Spectral Properties of the k-Body Embedded Gaussian Ensembles of Random Matrices
We consider m spinless Fermions in l > m degenerate single-particle levels interacting via a k-body random interaction with Gaussian probability distribution and k <= m in the limit l to…
Luis Benet, Thomas Rupp, Hans A. WeidenmuellerOct 26, 2000
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Non-Universal Behavior of the k-Body Embedded Gaussian Unitary Ensemble of Random Matrices
Using a novel approach, we investigate the shape of the average spectrum and the spectral fluctuations of the k-body embedded unitary ensemble in the limit of large matrix dimension. We identify…
Luis Benet, Thomas Rupp, Hans A. WeidenmuellerOct 26, 2000
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Generalized Thermostatistical Description of Intermittency and Non-extensivity in Turbulence and Financial Markets
We describe a simple and accurate framework for modeling the statistical behavior of both fully developed turbulence and short-term dynamics of financial markets based on the formalism of…
F. M. Ramos, C. Rodrigues Neto, R. R. RosaOct 26, 2000
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Geometry dominated fluid adsorption on sculptured substrates
Experimental methods allow the shape and chemical composition of solid surfaces to be controlled at a mesoscopic level. Exposing such structured substrates to a gas close to coexistence with its…
C. Rascon, A. O. ParryOct 26, 2000
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From favorable atomic configurations to supershell structures: a new interpretation of conductance histograms
Title: From favorable atomic configurations to supershell structures: a new interpretation of conductance histograms Authors: A. Hasmy (IVIC), E. Medina (IVIC), P.A. Serena (CSIC,IVIC) Comments: 7…
A. Hasmy, E. Medina, P. A. SerenaOct 26, 2000
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Statistical Analysis of Native Contact Formation in the Folding of Designed Model Proteins
The time evolution of the formation probability of native bonds has been studied for designed sequences which fold fast into the native conformation. From this analysis a clear hierarchy of bonds…
G. Tiana, R. A. BrogliaOct 25, 2000
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Phase separation in La0.5Ca0.5MnO3 doped with 1% 119Sn detected by Mössbauer spectroscopy
1% 119Sn-doped La0.5Ca0.5MnO3 was studied by Mössbauer spectroscopy, magnetic moment and resistivity measurements. The Mössbauer spectra below the charge-ordering temperature are…
A. Simopoulos, G. Kallias, E. Devlin et al.Oct 25, 2000
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Diabolical Points in Molecular Magnets with a Four-Fold Easy Axis
We study the points of degeneracy (diabolical points) in magnetic molecules such as Mn12-acetate that have an easy axis of four-fold symmetry. This is done for general magnetic field that need not…
Chang-Soo Park, Anupam GargOct 24, 2000
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Non-Equilibrium Duality
The dual 'worldline', or 'string', description of adiabatic Ginzburg-Landau field theory near a phase transition in terms of quasi-Brownian strings and loops is well understood. In…
R. J. RiversOct 24, 2000
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Oscillator Strength of Metallic Carbon Nanotubes
Based on the tight binding method with hopping integral between the nearest-neighbor atoms, an oscillator strength ∫0∞ ω Re σ(ω) is discussed for armchair and metallic zigzag…
H. YoshiokaOct 23, 2000
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Scattering properties of a cut-circle billiard waveguide with two conical leads
We examine a two-dimensional electron waveguide with a cut-circle cavity and conical leads. By considering Wigner delay times and the Landauer-Büttiker conductance for this system, we probe the…
Kathrin Fuchss, Suhan Ree, L. E. ReichlOct 20, 2000
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A.model of cation ordering in A(B'xB''1-x)O3 relaxors
We have shown that the lattice-gas model with four repulsive pair interaction constants (corresponding to the four nearest coordination shells) on a simple cubic lattice is a sufficient model to…
S. Lapinskas, E. E. Tornau, A. RosengrenOct 20, 2000
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Carrier relaxation with LO phonon decay in semiconductor quantum dots
Analysis of an exactly soluble model of phonons coupled to a carrier in a quantum dot provides a clear illustration of a phonon bottleneck to relaxation. The introduction of three-phonon interactions…
S. A. Levetas, M. J. Godfrey, P. DawsonOct 20, 2000
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Quantum group invariant, nonextensive quantum statistical mechanics
We study the consequences of introducing quantum group invariance in the formalism of nonextensive quantum statistical mechanics. We find that the corresponding thermodynamical system is equivalent…
Marcelo R. UbriacoOct 19, 2000
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On Financial Markets Trading
Starting from the observation of the real trading activity, we propose a model of a stockmarket simulating all the typical phases taking place in a stock exchange. We show that there is no need of…
Lorenzo Matassini, Fabio FranciOct 19, 2000
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Magnetostriction and magnetoelastic domains in antiferromagnets
The problem of the observable equilibrium domain structure in pure antiferromagnets (and other thermoelastics) is investigated with the use of continuous elasticity theory. It is shown that…
Helen Gomonay, Vadim LoktevOct 18, 2000
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Exciton-exciton interaction in quantum wells. Optical properties and energy and spin relaxation
The gas of interacting excitons in quantum wells is studied. We obtain the Hamiltonian of this gas by the projection of the electron-hole plasma Hamiltonian to exciton states and an expansion in a…
S. Ben-Tabou de-Leon, B. LaikhtmanOct 18, 2000
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