Low Dimensional Ordering on a Lattice ModelA simple d-dimensional lattice model is proposed, incorporating some degree of frustration and thus capable of describing some aspects of molecular orientation in covalently bound molecular solids.…Fabio Siringo·Jan 8, 1997SaveLearn
Theory of Spin Fluctuations in Striped Phases of Doped Antiferromagnetic CupratesWe study the properties of generalized striped phases of doped cuprate planar quantum antiferromagnets. We invoke an effective, spatially anisotropic, non-linear sigma model in two space dimensions.…Daniel Hone, A. H. Castro Neto·Jan 8, 1997SaveLearn
Fermi Systems with Strong Forward ScatteringWe review the theory of interacting Fermi systems whose low-energy physics is governed by forward scattering, i.e. scattering processes generated by effective interactions with small momentum…W. Metzner, C. Castellani, C. Di Castro·Jan 3, 1997SaveLearn
Transmission and Spectral Aspects of Tight Binding Hamiltonians for the Counting Quantum Turing MachineIt was recently shown that a generalization of quantum Turing machines (QTMs), in which potentials are associated with elementary steps or transitions of the computation, generates potential…Paul Benioff·Jan 2, 1997SaveLearn
Phenomenological Theory of Mode Collapse-revival in Confined Bose GasA phenomenological theory of mode collapse-revival for a system with a weak nonlinearity is presented. The theory takes into account fluctuations of the number n of quanta of oscillations. The…L. P. Pitaevskii·Jan 2, 1997SaveLearn
Giant persistent current in free-electron model with flat Fermi surfaceFor the first time the persistent current in a 2D free-electron system has been calculated analytically. The tight binding model is considered on a square lattice with filling factor 1/2. The array…E. V. Tsiper, A. L. Efros·Dec 31, 1996SaveLearn
Electronic States of doped spin ladders (Sr,Ca)14Cu24O41We examine the electronic states of Sr14-xCaxCu24O41 by the ionic and cluster model approach. It is found that self-doped holes are likely to stay on the chain at x=0 and the Ca…Yoshiaki Mizuno, Takami Tohyama, Sadamichi Maekawa·Dec 31, 1996SaveLearn
Band structure and optical anisotropy in V-shaped and T-shaped semiconductor quantum wiresWe present a theoretical investigation of the electronic and optical properties of V- and T-shaped quantum wires. Valence band mixing as well as realistic sample geometries are fully included through…G. Goldoni, F. Rossi, E. Molinari et al.·Dec 31, 1996SaveLearn
Wigner crystallization in quantum electron bilayersThe phase diagram of quantum electron bilayers in zero magnetic field is obtained using density functional theory. For large electron densities the system is in the liquid phase, while for smaller…G. Goldoni, F. M. Peeters·Dec 31, 1996SaveLearn
Interband mixing between two-dimensional states localized in a surface quantum well and heavy hole states of the valence band in narrow gap semiconductorTheoretical calculations in the framework of Kane model have been carried out in order to elucidate the role of interband mixing in forming the energy spectrum of two-dimensional carriers, localized…V. A. Larionova, A. V. Germanenko·Dec 30, 1996SaveLearn
Nonhermitean Random Matrix ModelsWe introduce an extension of the diagrammatic rules in random matrix theory and apply it to nonhermitean random matrix models using the 1/N approximation. A number of one- and two-point functions are…Romuald A. Janik, Maciej A. Nowak, Gabor Papp et al.·Dec 29, 1996SaveLearn
Statistics of the Charging Spectrum of a Two-Dimensional Coulomb Glass IslandThe fluctuations of capacitance of a two-dimensional island are studied in the regime of low electron concentration and strong disorder, when electrons can be considered classical particles. The…A. A. Koulakov, F. G. Pikus, B. I. Shklovskii·Dec 29, 1996SaveLearn
Chaotic enhancement of hydrogen atoms excitation in magnetic and microwave fieldsWe numerically investigate multiphoton ionization of excited hydrogen atoms in magnetic and microwave fields when up to 600 photons are required for ionization. The analytical estimates for the…G. Benenti, G. Casati, D. L. Shepelyansky·Dec 29, 1996SaveLearn
Replica Method for Wide Correlators in Gaussian Orthogonal, Unitary And Symplectic Random Matrix EnsemblesWe calculate connected correlators in Gaussian orthogonal, unitary and symplectic random matrix ensembles by the replica method in the 1/N-expansion. We obtain averaged one-point Green's…Chigak Itoi, Hisamitsu Mukaida, Yoshinori Sakamoto·Dec 26, 1996SaveLearn
Renormalization Group Study of Sandpile on the Triangular LatticeWe apply the renormalization group approach to the sandpile on the triangular lattice. The only attractive fixed point is found. The obtained fixed point height probabilities are compared with…Vl. V. Papoyan, A. M. Povolotsky·Dec 25, 1996SaveLearn
Investigation of conduction band structure, electron scattering mechanisms and phase transitions in indium selenide by means of transport measurements under pressureIn this work we report on Hall effect, resistivity and thermopower measurements in n-type indium selenide at room temperature under either hydrostatic and quasi-hydrostatic pressure. Up to 40 kbar (=…D. Errandonea, A. Segura, J. F. Sánchez-Royo et al.·Dec 23, 1996SaveLearn
Instabilities and disorder of the domain patterns in the systems with competing interactionsThe dynamics of the domains is studied in a two-dimensional model of the microphase separation of diblock copolymers in the vicinity of the transition. A criterion for the validity of the mean field…C. B. Muratov·Dec 21, 1996SaveLearn
On Pair-Particle Distribution in Imperfect Bose GasA simple model of estimating the radial distribution function of an imperfect Bose gas in the ground state is presented. The model is based on integro-differential equations derived by considering…A. A. Shanenko·Dec 20, 1996SaveLearn
Representing Structural Information of Helical Charge Distributions in Cylindrical CoordinatesStructural information in the local electric field produced by helical charge distributions, such as dissolved DNA, is revealed in a straightforward manner employing cylindrical coordinates.…David Hochberg, Thomas W. Kephart, Glenn Edwards·Dec 20, 1996SaveLearn
Scaling and thermodynamics of a trapped Bose-condensed gasWe investigate the thermodynamics of a Bose gas interacting with repulsive forces and confined in a harmonic trap. We show that the relevant parameters of the system (temperature, number N of atoms,…S. Giorgini, L. Pitaevskii, S. Stringari·Dec 20, 1996SaveLearn
How to observe distinct universal conductances in tunneling to quantum Hall states: having the right contactsWe show that different universal values can be obtained for the two-terminal conductance of a fractional quantum Hall state. At large voltages, or strong coupling, the conductance of a point-like…Claudio de C. Chamon, Eduardo Fradkin·Dec 19, 1996SaveLearn
A Possible Mechanism for Pseudo-Gap in CupratesThe electron spectrum in the normal phase of cuprates is analyzed in terms of the boson-fermion model. It is argued that the existence of the uncondensed pairs and the quasi-two-dimensional nature of…Hai-cang Ren·Dec 19, 1996SaveLearn
Magnetic properties of the 2D t-t'-Hubbard modelThe two-dimensional (2D) t-t'-Hubbard model is studied within the slave-boson (SB) theory. At half-filling, a paramagnetic to antiferromagnetic phase transition of first order at a finite…U. Trapper, H. Fehske, D. Ihle·Dec 19, 1996SaveLearn
Nonlinear Dynamics of a Bose Condensed GasWe investigate the dynamic behavior of a Bose-condensed gas of alkali atoms interacting with repulsive forces and confined in a magnetic trap at zero temperature. Using the Thomas-Fermi…F. Dalfovo, C. Minniti, S. Stringari et al.·Dec 19, 1996SaveLearn
Spontaneous photon emission stimulated by two Bose condensatesWe show that the phase difference of two overlapping ground state Bose-Einstein condensates can effect the optical spontaneous emission rate of excited atoms. Depending on the phase difference the…C. M. Savage, Janne Ruostekoski, Dan F. Walls·Dec 18, 1996SaveLearn