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Condensed Matter papers — page 245

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Quantum Hall Effect in Quasi-One-Dimensional Conductors: The Roles of Moving FISDW, Finite Temperature, and Edge States
This paper reviews recent developments in the theory of the quantum Hall effect (QHE) in the magnetic-field-induced spin-density-wave (FISDW) state of the quasi-one-dimensional organic conductors…
Victor M. Yakovenko, Hsi-Sheng GoanJul 18, 1996
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Cosmological Experiments in Condensed Matter Systems
Topological defects are thought to be left behind by the cosmological phase transitions which occur as the universe expands and cools. Similar processes can be studied in the phase transitions which…
Wojciech Hubert ZurekJul 18, 1996
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Shot noise in resonant tunneling structures
We propose a quantum mechanical approach to noise in resonant tunneling structures, that can be applied in the whole range of transport regimes, from completely coherent to completely incoherent. In…
G. Iannaccone, M. Macucci, B. PellegriniJul 18, 1996
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Bragg resonances for tunneling between edges of a 2D Quantum Hall system
A theory is presented for tunneling between compressible regions on the sides of a narrow incompressible Quantum Hall strip. Assuming that electron interactions lead to formation of a Wigner crystal…
M. B. Hastings, L. S. LevitovJul 18, 1996
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Heisenberg Spin Glass on a Hypercubic Cell
We present results of a Monte Carlo simulation of an Heisenberg Spin Glass model on a hipercubic cell of size 2 in D dimensions. Each spin interacts with D nearest neighbors and the…
Daniel A. StarioloJul 18, 1996
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Jacobian Elliptic Wave Solutions for the Wadati-Segur-Ablowitz Equation
Jacobian elliptic travelling wave solutions for a new Hamiltonian amplitude equation determining some instabilities of modulated wave train are obtained. By mere variation of the Jacobian elliptic…
Chooi-Gim Rosy Teh, W. K. Koo, B. S. LeeJul 18, 1996
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On the Jastrow Wave Function for N-Particles on a Plane
The possibility of describing quantum mechanical particles on a plane by a Jastrow wave function is studied. We obtain the condition under which the particles interact through pair potentials. It is…
A. Azhari, T. T. TruongJul 17, 1996
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The Nature of the Hall Insulator
We have conducted an experimental study of the linear transport properties of the magnetic-field induced insulating phase which terminates the quantum Hall (QH) series in two dimensional electron…
D. Shahar, D. C. Tsui, M. Shayegan et al.Jul 17, 1996
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Nagaoka State and Degeneracy in the U=infinity Hubbard Model
The U=infinity Hubbard model on a hypercubic lattice with exactly one hole is studied. It is seen that a degeneracy can occur in the maximal-spin sector. It is proved variationally that the Nagaoka…
V. Subrahmanyam, Fajian ShiJul 17, 1996
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c-axis Josephson Tunnelling in Twinned and Untwinned YBCO-Pb Junctions
Within a microscopic two band model of planes and chains with a pairing potential in the planes and off diagonal pairing between planes and chains we find that the chains make the largest…
C. O'Donovan, M. D. Lumsden, B. D. Gaulin et al.Jul 17, 1996
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Collective modes and correlations in one-component plasmas
The static and time-dependent potential and surface charge correlations in a plasma with a boundary are computed for different shapes of the boundary. The case of a spheroidal or spherical…
G. TellezJul 17, 1996
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Fermi Surface of The One-dimensional Kondo Lattice Model
We show a strong indication of the existence of a large Fermi surface in the one-dimensional Kondo lattice model. The characteristic wave vector of the model is found to be kF=(1+ρ)π/2, ρ being…
S. Moukouri, L. G. CaronJul 17, 1996
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Onsager Relations and Hydrodynamic Balance Equations in 2D Quantum Wells
In this letter we clarify the role of heat flux in the hydrodynamic balance equations in 2D quantum wells, facilitating the formulation of an Onsager relation within the framework of this theory. We…
M. W. Wu, H. L. Cui, W. Sun et al.Jul 17, 1996
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Mesoscopic conductance fluctuations in dirty quantum dots with single channel leads
We consider a distribution of conductance fluctuations in quantum dots with single channel leads and continuous level spectra and we demonstrate that it has a distinctly non-Gaussian shape and strong…
Edward McCann, Igor V. LernerJul 17, 1996
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Comment on ``Turbulent cascades in foreign exchange markets''
Recently, Ghashghaie et al. have shown that some statistical aspects of fully developed turbulence and exchange rate fluctuations exhibit striking similarities (Nature 381, 767 (1996)). The authors…
Alain Arneodo, Jean-Philippe Bouchaud, Rama Cont et al.Jul 17, 1996
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Reflectance Fluctuations in an Absorbing Random Waveguide
We study the statistics of the reflectance (the ratio of reflected and incident intensities) of an N-mode disordered waveguide with weak absorption γ per mean free path. Two distinct regimes are…
T. Sh. Misirpashaev, C. W. J. BeenakkerJul 17, 1996
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Localization in a Disordered Multi-Mode Waveguide with Absorption or Amplification
An analytical and numerical study is presented of transmission of radiation through a multi-mode waveguide containing a random medium with a complex dielectric constant ε= ε'+iε''.…
T. Sh. Misirpashaev, J. C. J. Paasschens, C. W. J. BeenakkerJul 17, 1996
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Low-energy quantum dynamics of atoms at defects. Interstitial oxygen in silicon
The problem of the low-energy highly-anharmonic quantum dynamics of isolated impurities in solids is addressed by using path-integral Monte Carlo simulations. Interstitial oxygen in silicon is…
Rafael Ramirez, Carlos P. Herrero, Emilio Artacho et al.Jul 16, 1996
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Fractal Dimension of Backbone of Eden Trees
We relate the fractal dimension of the backbone, and the spectral dimension of Eden trees to the dynamical exponent z. In two dimensions, it gives fractal dimension of backbone equal to 4/3 and…
S. S. Manna, D. DharJul 16, 1996
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Condensate fraction and critical temperature of a trapped interacting Bose gas
By using a mean field approach, based on the Popov approximation, we calculate the temperature dependence of the condensate fraction of an interacting Bose gas confined in an anisotropic harmonic…
S. Giorgini, L. Pitaevskii, S. StringariJul 16, 1996
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Polaron and bipolaron formation in a cubic perovskite lattice
The Rice-Sneddon model for BaBiO3 is a nice model Hamiltonian for considering the properties of polarons and bipolarons in a three-dimensional oxide crystal. We use exact diagonalization methods…
Vladimir N. Kostur, Philip B. AllenJul 16, 1996
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Stability of Bose condensed atomic Li-7
We study the stability of a Bose condensate of atomic 7Li in a (harmonic oscillator) magnetic trap at non-zero temperatures. In analogy to the stability criterion for a neutron star, we conjecture…
M. Houbiers, H. T. C. StoofJul 16, 1996
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Deformation of polymer films by bending forces
We study the deformation of nano--scale polymer films which are subject to external bending forces by means of computer simulation. The polymer is represented by a generalized bead--spring--model,…
Gerald Paetzold, Thorsten Hapke, Andreas Linke et al.Jul 16, 1996
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Modelling of amorphous polymer surfaces in computer simulation
We study surface effects in amorphous polymer systems by means of computer simulation. In the framework of molecular dynamics, we present two different methods to prepare such surfaces. Free…
Thorsten Hapke, Andreas Linke, Gerald Paetzold et al.Jul 16, 1996
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The Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction across a tunneling junction out of equilibrium
The Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between two magnetic s-d spin impurities across a tunneling junction is studied when the system is driven out of equilibrium through biasing…
N. F. Schwabe, Ned S. Wingreen, R. J. ElliottJul 16, 1996
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