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Condensed Matter papers — page 226

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Constraints on Beta Functions from Duality
We analyze the way in which duality constrains the exact beta function and correlation length in single-coupling spin systems. A consistency condition we propose shows very concisely the relation…
P. H. Damgaard, P. E. HaagensenSep 25, 1996
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Spectral functions in doped transition metal oxides
We present experimental photoemission and inverse photoemission spectra of SrTiO3- δ representing electron doped d0 systems. Photoemission spectra in presence of electron doping exhibit…
D. D. Sarma, S. R. Barman, H. Kajueter et al.Sep 25, 1996
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Effect of Finite Impurity Mass on the Anderson Orthogonality Catastrophe in One Dimension
A one-dimensional tight-binding Hamiltonian describes the evolution of a single impurity interacting locally with N electrons. The impurity spectral function has a power-law singularity…
Herve CastellaSep 25, 1996
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Nonstationary Transport by Internal White Noise and "Localization" in Ratchets
We revealed a right-left asymmetry of the inter-well mean first passage times for the Brownian particles in a ratchet potential under internal white noise. We showed analytically and numerically that…
Nikolai Brilliantov, Peter StrizhakSep 25, 1996
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Elementary excitations, exchange interaction and spin-Peierls transition in CuGeO3
The microscopic description of the spin-Peierls transition in pure and doped CuGeO3 is developed taking into account realistic details of crystal structure. It it shown that the presence of…
D. Khomskii, W. Geertsma, M. MostovoySep 25, 1996
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Superfluid - Bose-Glass Transition in Weakly Disordered Commensurate One-Dimensional System
We study the effect of commensurability (integer filling factor) on the superfluid (SF) - Bose-glass (BG) transition in a one-dimensional disordered system in the limit of weak disorder, when the…
Boris V. SvistunovSep 25, 1996
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Critical Temperature of a Trapped Interacting Bose Gas in the Local Density Approximation
The Bose gas in an external potential is studied by means of the local density approximation. An analytical result is derived for the dependence of the critical temperature of Bose-Einstein…
Hualin Shi, Wei-Mou ZhengSep 25, 1996
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On the Number of Incipient Spanning Clusters
In critical percolation models, in a large cube there will typically be more than one cluster of comparable diameter. In 2D, the probability of k>>1 spanning clusters is of the order e-αk2.…
Michael AizenmanSep 24, 1996
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A.C.-Transport Through a Two-Dimensional Quantum Point Contact
We calculate the admittance of a two-dimensional quantum point contact (QPC) using a Boltzman-like kinetic equation derived for a partial Wigner distribution function in an effective potential. We…
I. E. Aronov, G. P. Berman, D. K. Campbell et al.Sep 24, 1996
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Piezoelectricity: Quantized Charge Transport Driven by Adiabatic Deformations
We study the (zero temperature) quantum piezoelectric response of Harper-like models with broken inversion symmetry. The charge transport in these models is related to topological invariants (Chern…
J. E. Avron, J. Berger, Y. LastSep 24, 1996
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Dynamics of disordered heavy Fermion systems
Dynamics of the disordered heavy Fermion model of Dobrosavljevic et al. are calculated using an expression for the spectral function of the Anderson model which is consistent with quantum Monte Carlo…
A. Chattopadhyay, M. JarrellSep 24, 1996
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Electronic Raman scattering in the single-CuO2 layered superconductor Tl2Ba2CuO6+x
Electronic Raman scattering in Tl-2201 has been investigated in order to test whether the scattering cross-section in high temperature superconductors depends on the number of CuO2-planes, i.e.…
L. V. Gasparov, P. Lemmens, M. Brinkmann et al.Sep 24, 1996
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Magnetic Correlations in the Two Dimensional Anderson-Hubbard Model
The two dimensional Hubbard model in the presence of diagonal and off-diagonal disorder is studied at half filling with a finite temperature quantum Monte Carlo method. Magnetic correlations as well…
Martin Ulmke, Richard T. ScalettarSep 24, 1996
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A Quasi-exact Formula for Ising critical temperatures on Hypercubic Lattices
We report a quasi-exact power law behavior for Ising critical temperatures on hypercubes. It reads J/kBTc=K0[(1-1/d)(q-1)]a where K0=0.6260356, a=0.8633747, d is the space dimension, q…
Serge Galam, Alain MaugerSep 24, 1996
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Variational Thomas-Fermi Theory of a Nonuniform Bose Condensate at Zero Temperature
We derive a description of the spatially inhomogeneous Bose-Einstein condensate which treats the system locally as a homogeneous system. This approach, similar to the Thomas-Fermi model for the…
E. Timmermans, P. Tommasini, K. HuangSep 24, 1996
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Hubbard model versus t-J model: The one-particle spectrum
The origin of the apparent discrepancies between the one-particle spectra of the Hubbard and t-J models is revealed: Wavefunction corrections, in addition to the three-site terms, should supplement…
Henk Eskes, Robert EderSep 24, 1996
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Comment on ``Generalized Dynamic Scaling for Critical Relaxation" [Phys. Rev. Lett. 77, 679 (1996), cond-mat/9607013]
We point out that in nonequilibrium relaxational processes the magnetic field of the initial state (instead of the initial magnetization) has to be considered as the additional scaling field (related…
U. Ritschel, P. CzernerSep 24, 1996
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Dynamical density-density correlations in one-dimensional Mott insulators
The dynamical density-density correlation function is calculated for the one-dimensional, half-filled Hubbard model extended with nearest neighbor repulsion using the Lanczos algorithm for finite…
Walter Stephan, Karlo PencSep 24, 1996
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Short-time scaling behavior of growing interfaces
The short-time evolution of a growing interface is studied within the framework of the dynamic renormalization group approach for the Kadar-Parisi-Zhang (KPZ) equation and for an idealized continuum…
M. KrechSep 24, 1996
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Equilibrium properties of a Josephson junction ladder with screening effects
In this paper we calculate the ground state phase diagram of a Josephson Junction ladder when screening field effects are taken into account. We study the ground state configuration as a function of…
Juan J. Mazo, Jose C. CiriaSep 24, 1996
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Integrable quantum chains combining site states in different representations of su(3)
The general expression for the local matrix L(θ) of a quantum chain with the site space in any representation of su(3) is obtained. This is made by generalizing L(θ) from the fundamental…
J. Abad, M. RiosSep 24, 1996
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Anderson transition in three-dimensional disordered systems with symplectic symmetry
The Anderson transition in a 3D system with symplectic symmetry is investigated numerically. From a one-parameter scaling analysis the critical exponent ν of the localization length is extracted…
T. Kawarabayashi, T. Ohtsuki, K. Slevin et al.Sep 24, 1996
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Antiferromagnetic Correlation under the External Magnetic Field in the Hubbard Model
By deriving a generalized Harper's equation, we investigate the effects of temperature T and hole doping on antiferromagnetically correlated electrons under the influence of an applied…
S. P. Hong, H. Doh, S. H. Suck SalkSep 24, 1996
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Quantum Phonon Optics: Coherent and Squeezed Atomic Displacements
In this paper we investigate coherent and squeezed quantum states of phonons. The latter allow the possibility of modulating the quantum fluctuations of atomic displacements below the zero-point…
X. Hu, Franco NoriSep 23, 1996
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Quantum Melting of a Two-Dimensional Vortex Lattice at Zero Temperature
We consider the quantum melting of a two-dimensional flux lattice at temperature T = 0 in the ``superclean limit.'' In this regime, we find that vortex motion is dominated by the Magnus…
A. Rozhkov, D. StroudSep 23, 1996
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