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Condensed Matter papers — page 254

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Level spectroscopy II - application to the Gaussian model -
It was a difficult problem to determine the Gaussian fixed line from the numerical data, because close to the Berezinskii-Kosterlitz-Thouless multicritical point the divergence of the correlation…
Kiyohide Nomura, Atsuhiro KitazawaJun 18, 1996
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Dynamical Phase Transition in a Driven Disordered Vortex Lattice
Using Langevin dynamics, we have investigated the dynamics of vortices in a disordered two dimensional superconductor subjected to a uniform driving current. The results provide direct numerical…
Seungoh Ryu, M. Hellerqvist, S. Doniach et al.Jun 18, 1996
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Exact Friedel oscillations in the g=1/2 Luttinger liquid
A single impurity in the 1D Luttinger model creates a local modification of the charge density analogous to the Friedel oscillations. In this paper, we present an exact solution of the case…
A. Leclair, F. Lesage, H. SaleurJun 17, 1996
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A Study of The Formation of Stationary Localized States Due to Nonlinear Impurities Using The Discrete Nonlinear Schrödinger Equation
The Discrete Nonlinear Schrodinger Equation is used to study the formation of stationary localized states due to a single nonlinear impurity in a Caley tree and a dimeric nonlinear impurity…
B. C. Gupta, K. KunduJun 17, 1996
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Global Persistence Exponent for Critical Dynamics
A `persistence exponent' θ is defined for nonequilibrium critical phenomena. It describes the probability, p(t) t-θ, that the global order parameter has not changed sign in the time…
S. N. Majumdar, A. J. Bray, S. J. Cornell et al.Jun 17, 1996
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Fractional Quantum Hall Effect in Bilayer Two Dimensional Hole Gas Systems
We have studied the fractional and integer quantum Hall effect in high mobility double layer 2D hole gas systems. The large hole effective mass inhibits tunneling, allowing us to investigate the…
A. R. Hamilton, M. Y. Simmons, F. M. Bolton et al.Jun 17, 1996
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Continuous Versus First Order Transitions in Compressible Diluted Magnets
The interplay between disorder and compressibility in Ising magnets is studied. Contrary to pure systems in which a weak compressibility drives the transition first order, we find from a…
Yonathan Shapir, Serge GalamJun 17, 1996
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On the presence of mid-gap states in CaV4O9
Using exact diagonalizations of finite clusters with up to 32 sites, we study the J1-J2 model on the 1/5 depleted square lattice. Spin-spin correlation functions are consistent with plaquette…
Marc Albrecht, Frederic Mila, Didier PoilblancJun 17, 1996
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Exact results concerning multifield moduli of two-phase composites
Chen has recently shown how the response matrix of a two-phase composite can be written as linear combinations of products of the component matrices. We elaborate on Chen's expansions by deriving…
Mordehai MilgromJun 17, 1996
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Common trends in the critical behavior of the Ising and directed walk models
We consider layered two-dimensional Ising and directed walk models and show that the two problems are inherently related. The information about the zero-field thermodynamical properties of the Ising…
F. Igloi, L. TurbanJun 17, 1996
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Diffusion in disordered media as a process with memory
The problem of a random walk in a disordered media is mapped into a model of a random walk with memory. The latter model, as opposed to the former one, does not make reference to a particular…
Michele Vendruscolo, Matteo MarsiliJun 17, 1996
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A Non-linear Sigma-model for Partially Polarized QH-states
We consider a two-component quantum Hall system within a Landau-Ginzburg theory with two Chern-Simons gauge fields. From this theory we derive a sigma model covariantly coupled to one Chern-Simons…
T. H. Hansson, A. Karlhede, J. M. LeinaasJun 17, 1996
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A note on ferromagnetism in the Hubbard model on the complete graph
Recently there have appeared some papers which discuss the existence of ferromagnetism in the Hubbard model defined on the complete graph. At least for the special electron number Ne=N-1, where N…
Andreas Mielke, Hal TasakiJun 17, 1996
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Randomly inhomogeneous Luttinger liquid: Fluctuations of the tunnel conductance
The Luttinger liquid in which the concentration of electrons varies randomly with coordinate is considered. We study the fluctuations of the tunnel conductance, caused by the randomness in the…
A. Gramada, M. E. RaikhJun 16, 1996
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Conduction band spin splitting and negative magnetoresistance in A3 B5 heterostructures
The quantum interference corrections to the conductivity are calculated for an electron gas in asymmetric quantum wells in a magnetic field. The theory takes into account two different types of the…
F. G. Pikus, G. E. PikusJun 16, 1996
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Weak Localization and Negative Magnetoresistance in Wurtzite-type Crystals
We have developed a theory of the negative magnetoresistance due to the weak localization in uniaxial wurtzite-type crystals, in which the spin splitting of the conduction band is linear in the wave…
F. G. Pikus, G. E. PikusJun 15, 1996
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The Kosterlitz-Thouless Transitions on Fluctuating Surface of Genus Zero
We investigate the Kosterlitz-Thouless transition for hexatic order on a fluctuating spherical surface of genus zero and derive a Coulomb gas Hamiltonian to describe it. In the Coulomb gas…
Jeong-Man ParkJun 14, 1996
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Finite temperature correlations in the one-dimensional quantum Ising model
We extend the form-factors approach to the quantum Ising model at finite temperature. The two point function of the energy is obtained in closed form, while the two point function of the spin is…
A. Leclair, F. Lesage, S. Sachdev et al.Jun 14, 1996
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A new non-Fermi liquid fixed point
We study a new exchange interaction in which the conduction electrons with pseudo spin Sc=3/2 interact with the impurity spin SI=1/2. Due to the overscreening of the impurity spin by higher…
Tae-Suk Kim, L. N. Oliveira, D. L. CoxJun 14, 1996
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Vortex excitation in superfluid 4He: A Diffusion Monte Carlo study
We present a diffusion Monte Carlo study of a single vortex in two-dimensional superfluid liquid 4He within the fixed node approximation. We use both the Feynman phase and an improved phase which…
S. Giorgini, J. Boronat, J. CasullerasJun 14, 1996
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Properties of Paired Quantum Hall States at ν=2
The energetic properties of a paired quantum Hall state at Landau level filling ν=2 are investigated using variational Monte Carlo techniques. Pairing is found to be energetically favorable in…
F. G. Pikus, A. M. TikofskyJun 14, 1996
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n-atic Order and Continuous Shape Changes of Deformable Surfaces of Genus Zero
We consider in mean-field theory the continuous development below a second-order phase transition of n-atic tangent plane order on a deformable surface of genus zero with order parameter $ψ=…
Jeong-Man Park, T. C. Lubensky, F. C. MacKintoshJun 14, 1996
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Transfer and Decay of an Exciton Coupled to Vibrations in a Dimer
Transfer and decay dynamics of an exciton coupled to a polarization vibration in a dimer is investigated in a mixed quantum-classical picture with the exciton decay incorporated by a sink site. Using…
Holger Schanz, Ivan Barvik, Bernd EsserJun 14, 1996
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Nonlinear transverse magnetic moment in anisotropic superconductors
We consider the nonlinear transverse magnetic moment that arises in the Meissner state of superconductors with strongly anisotropic order parameter. We compute this magnetic moment as a function of…
Igor Zutic, Oriol T. VallsJun 14, 1996
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Relationship Between Structural Fractal and Possible Dynamic Scaling Properties in Protein Folding
In this letter, the possible dynamic scaling properties of protein molecules in folding are investigated theoretically by assuming that the protein molecules are percolated networks. It is shown that…
Liang-Jian Zou, X. G. Gong, Zheng-Gang ZhuJun 14, 1996
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