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Condensed Matter papers — page 161

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Random Magnetic Interactions and Spin Glass Order Competing with Superconductivity: Interference of the Quantum Parisi Phase
We analyse the competition between spin glass (SG) order and local pairing superconductivity (SC) in the fermionic Ising spin glass with frustrated fermionic spin interaction and nonrandom attractive…
H. Feldmann, R. OppermannDec 1, 1998
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Orbital Magnetism in Small Quantum Dots with Closed Shells
It is found that various kind of shell structure which occurs at specific values of the magnetic field leads to the disappearance of the orbital magnetization for particular magic numbers of small…
W. D. Heiss, R. G. NazmitdinovDec 1, 1998
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Stripe phase ordering as quantum interference phenomenon
A quantum interference mechanism of the stripe phase instability in quasi one-dimensional (1D) repulsive electron system is proposed. The leading spin-charge coupling term in Landau functional is…
Sergei I. MukhinNov 29, 1998
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Phase Transition in the Passive Scalar Advection
The paper studies the behavior of the trajectories of fluid particles in a compressible generalization of the Kraichnan ensemble of turbulent velocities. We show that, depending on the degree of…
Krzysztof Gawedzki, Massimo VergassolaNov 28, 1998
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Quantum Phase Transitions in 2d Quantum Liquids
These lectures provide a pedagogical introduction to the theory of continuous quantum phase transitions. Various two-dimensional condensed matter systems, such as a superconducting film, a quantum…
Adriaan M. J. SchakelNov 27, 1998
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Analysis of the valence band photoemission spectrum of Sr2CuO2Cl2 along the high-symmetry directions
Band structure calculations have been used to identify the different bands contributing to the polarisation-dependent photoemission spectra of the undoped model cuprate Sr2CuO2Cl2 at the…
R. Hayn, H. Rosner, V. Yu. Yushankhai et al.Nov 27, 1998
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Longitudinal and transverse forces on a vortex in superfluid 4He
We examine the transverse and longitudinal components of the drag force upon a straight vortex line due to the scattering of liquid 4He excitations. For this purpose, we consider a recently…
H. M. Cataldo, M. A. Despósito, D. M. JezekNov 26, 1998
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On the semiclassical treatment of anharmonic quantum oscillators via coherent states - The Toda chain revisited
We use coherent states as a time-dependent variational ansatz for a semiclassical treatment of the dynamics of anharmonic quantum oscillators. In this approach the square variance of the Hamiltonian…
John Schliemann, Franz G. MertensNov 26, 1998
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Density matrices in O(N) electronic structure calculations: theory and applications
We analyze the problem of determining the electronic ground state within O(N) schemes, focusing on methods in which the total energy is minimized with respect to the density matrix. We note that in…
D. R. Bowler, M. J. GillanNov 26, 1998
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One Dimensional Phonon Coupled Electron Tunneling: A Realistic Model
The transition probability for a one dimensional tunneling electron coupled to acoustical phonons is calculated, with the Feynman path-integral method for zero temperature. We considered a realistic…
E. Pazy, B. LaikhtmanNov 25, 1998
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Evolution of One-Particle and Double-Occupied Green Functions for the Hubbard Model at Half-Filling With Lifetime Effects Within The Moment Approach
We evaluate the one-particle and double-occupied Green functions for the Hubbard model at half-filling using the moment approach of Nolting. Our starting point is a self-energy, Σ(k,ω), which…
S. Schafroth, J. J. Rodríguez-NúñezNov 25, 1998
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Multifractal scaling of electronic transmission resonances in perfect and imperfect Fibonacci δ-function potentials
We present here a detailed multifractal scaling study for the electronic transmission resonances with the system size for an infinitely large one dimensional perfect and imperfect quasiperiodic…
Prabhat K Thakur, Parthapratim BiswasNov 25, 1998
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Absence of Fragmentation and Broken Spatial Symmetry in the Ground State of Dilute Bose Gases
Paper temporarily withdrawn for remodeling
Tin-Lun Ho, Gordon BaymNov 25, 1998
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Local Density of States in Superconductor-Ferromagnetic Hybrid Systems
In this Letter we discuss various properties of the local density of states (DOS) for a superconductor-ferromagnet hybrid system. The DOS is modified at small energies on both sides of the interface.…
Rosario Fazio, Carlo LucheroniNov 24, 1998
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Novel Nonreciprocal Acoustic Effects in Antiferromagnets
The possible occurrence of nonreciprocal acoustic effects in antiferromagnets in the absence of an external magnetic field is investigated using both (i) a microscopic formulation of the…
Roser Valenti, Claudius Gros, V. N. MuthukumarNov 23, 1998
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Berry's Phase Induced Bose-Einstein condensation into a Vortex State
The existence of a geometric phase in magnetic traps can be used to Bose condense a magnetically trapped atomic gas into a vortex state. We propose an experimental setup where a magnetic trap…
M. Olshanii, M. NaraschewskiNov 23, 1998
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Bound States for a Magnetic Impurity in a Superconductor
We discuss a solvable model describing an Anderson like impurity in a BCS superconductor. The model can be mapped onto an Ising field theory in a boundary magnetic field, with the Ising fermions…
Z. S. Bassi, A. LeClairNov 22, 1998
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Pressure of Membrane between Walls
For a single membrane of stiffness kappa fluctuating between two planar walls of distance d, we calculate analytically the proportionality constant in the pressure law p proportional to T2/kappa2…
H. KleinertNov 21, 1998
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Random Walkers in 1-D Random Environments: Exact Renormalization Group Analysis
Sinai's model of diffusion in one-dimension with random local bias is studied by a real space renormalization group which yields exact results at long times. The effects of an additional small…
Daniel S. Fisher, Pierre Le Doussal, Cecile MonthusNov 20, 1998
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Vortices in Quantum Spin Systems
We examine spin vortices in ferromagnetic quantum Heisenberg models with planar anisotropy on two-dimensional lattices. The symmetry properties and the time evolution of vortices built up from…
John Schliemann, Franz G. MertensNov 20, 1998
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Charging effects in the ac conductance of a double barrier resonant tunneling structure
There have been many studies of the linear response ac conductance of a double barrier resonant tunneling structure (DBRTS). While these studies are important, they fail to self-consistently include…
M. P. AnantramNov 19, 1998
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Metastable states and information propagation in a 1D array of locally-coupled bistable cells
We study the effect of metastable states on the relaxation process (and hence information propagation) in locally coupled and boundary-driven structures. We first give a general argument to show that…
M. P. Anantram, Vwani P. RoychowdhuryNov 19, 1998
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The Singlet-Triplet Pseudo-Jahn-Teller Centers in Copper Oxides
One of the most exciting features of the hole centers CuO45- in doped cuprates is an unusually complicated ground state which is the result of the electronic quasi-degeneracy. An additional…
A. S. Moskvin, Yu. D. PanovNov 19, 1998
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Bandgap Change of Carbon Nanotubes: Effect of Small Tensile and Torsional Strain
We use a simple picture based on the π electron approximation to study the bandgap variation of carbon nanotubes with uniaxial and torsional strain. We find (i) that the magnitude of slope of…
Liu Yang, M. P. Anantram, Jie Han et al.Nov 18, 1998
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Frictional Mechanics of Wet Granular Material
The mechanical response of a wet granular layer to imposed shear is studied experimentally at low applied normal stress. The granular material is immersed in water and the shear is applied by sliding…
J. -C. Geminard, W. Losert, J. P. GollubNov 18, 1998
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