Algebraic Bethe Ansatz for gl(2,1) Invariant 36-Vertex ModelsFour dimensional irreducible representations of the superalgebra gl(2,1) carry a free parameter. We compute the spectra of the corresponding transfer matrices by means of the nested algebraic Bethe…Markus P. Pfannmüller, Holger Frahm·Apr 15, 1996SaveLearn
Supersymmetry And Electron-hole Excitation in Semiconductor At Finite TemperatureThe fermionic and bosonic electron-hole low lying excitations in a semiconductor are analyzed at finite temperature in a unified way following Nambu's quasi-supersymmetric approach for the BCS…Xun Xue, Alvaro Ferraz·Apr 15, 1996SaveLearn
Low temperature series expansions for the square lattice Ising model with spin S > 1We derive low-temperature series (in the variable u = [-βJ/S2]) for the spontaneous magnetisation, susceptibility and specific heat of the spin-S Ising model on the square lattice for…I Jensen, A J Guttmann, I G Enting·Apr 15, 1996SaveLearn
Extrapolation procedure for low-temperature series for the square lattice spin-1 Ising modelThe finite-lattice method of series expansions has been combined with a new extrapolation procedure to extend the low-temperature series for the specific heat, spontaneous magnetisation and…I Jensen, A J Guttmann·Apr 15, 1996SaveLearn
Theory of random matrices with strong level confinement: orthogonal polynomial approachStrongly non-Gaussian ensembles of large random matrices possessing unitary symmetry and logarithmic level repulsion are studied both in presence and absence of hard edge in their energy spectra.…V. Freilikher, E. Kanzieper, I. Yurkevich·Apr 14, 1996SaveLearn
Infrared Behavior of Interacting Bosons at Zero TemperatureWe exploit the symmetries associated with the stability of the superfluid phase to solve the long-standing problem of interacting bosons in the presence of a condensate at zero temperature.…C. Castellani, C. Di Castro, F. Pistolesi et al.·Apr 12, 1996SaveLearn
Ginzburg Criterion for Coulombic CriticalityTo understand the range of close-to-classical critical behavior seen in various electrolytes, generalized Debye-Hueckel theories (that yield density correlation functions) are applied to the…Michael E. Fisher, Benjamin P. Lee·Apr 12, 1996SaveLearn
Dispersion of a single hole in the t-J modelThe dispersion of a single hole in the t-J model obtained by the exact result of 32 sites and the results obtained by self-consistent Born approximation and the Green function Monte Carlo method can…T. K. Lee, C. T. Shih·Apr 11, 1996SaveLearn
Mean Field Calculations of Bose-Einstein Condensation of 7Li Atoms In a Harmonic TrapA self-consistent mean-field theory for bosons for T>0 is used to reconcile predictions of collapse with recent observations of Bose-Einstein condensation of 7Li. Eigenfunctions of a (non-separable)…T. Bergeman·Apr 11, 1996SaveLearn
Comment on ``Observation of the ν=1 quantum Hall effect in a strongly localized two-dimensional system''In a recent Rapid Communication ``Observation of the ν=1 quantum Hall effect in a strongly localized two-dimensional system,'' Shahar, Tsui, and Cunningham reported a disorder --- magnetic…S. V. Kravchenko·Apr 11, 1996SaveLearn
Current-voltage characteristic, stability, and self-sustained current oscillations in resonant-tunneling n-doped semiconductor superlatticesWe review the statics and dynamics of electric-field domains on doped superlattices within a discrete drift model. A complete analysis of the construction and stability of stationary field profiles…L. L. Bonilla, M. Kindelan, M. Moscoso et al.·Apr 11, 1996SaveLearn
Parity-Affected Superconductivity in Ultrasmall Metallic GrainsWe investigate the breakdown of BCS superconductivity in ultra\/small metallic grains as a function of particle size (characterized by the mean spacing d between discrete electronic…Jan von Delft, Dmitrii S. Golubev, Wolfgang Tichy et al.·Apr 11, 1996SaveLearn
Strong-coupling behaviour in discrete Kardar-Parisi-Zhang equationsWe present a systematic discretization scheme for the Kardar-Parisi-Zhang (KPZ) equation, which correctly captures the strong-coupling properties of the continuum model. In particular we show that…T. J. Newman, A. J. Bray·Apr 11, 1996SaveLearn
Correlation of internal representations in feed-forward neural networksFeed-forward multilayer neural networks implementing random input-output mappings develop characteristic correlations between the activity of their hidden nodes which are important for the…Andreas Engel·Apr 11, 1996SaveLearn
Order Parameter at the Boundary of a Trapped Bose GasThrough a suitable expansion of the Gross-Pitaevskii equation near the classical turning point, we obtain an explicit solution for the order parameter at the boundary of a trapped Bose gas…F. Dalfovo, L. Pitaevskii, S. Stringari·Apr 11, 1996SaveLearn
The J1-J2 antiferromagnet with Dzyaloshinskii-Moriya interaction on the square lattice: An exact diagonalization studyWe examine the influence of an anisotropic interaction term of Dzyaloshinskii-Moriya (DM) type on the groundstate ordering of the J1-J2 spin-1/2-Heisenberg antiferromagnet on the square lattice.…A. Voigt, J. Richter·Apr 11, 1996SaveLearn
Fluctuation-Induced Interactions between Rods on a MembraneWe consider the interaction between two rods embedded in a fluctuating surface. The modification of fluctuations by the rods leads to an attractive long-range interaction between them. We consider…Ramin Golestanian, Mark Goulian, Mehran Kardar·Apr 11, 1996SaveLearn
Dimer and Néel order-parameter fluctuations in the spin-fluid phase of the s=1/2 spin chain with first and second neighbor couplingsThe dynamical properties at T=0 of the one-dimensional (1D) s=1/2 nearest-neighbor (nn) XXZ model with an additional isotropic next-nearest-neighbor (nnn) coupling are investigated by means of the…Yongmin Yu, Gerhard Müller, V. S. Viswanath·Apr 11, 1996SaveLearn
Universal Parametric Correlations of Conductance Peaks in Quantum DotsWe compute the parametric correlation function of the conductance peaks in chaotic and weakly disordered quantum dots in the Coulomb blockade regime and demonstrate its universality upon an…Y. Alhassid, H. Attias·Apr 11, 1996SaveLearn
Notes on the static dielectric response function in the density functional theoryWe discuss several aspects of the dielectric response theory application to the density functional theory. This field has been an unceasing source of confusion during several decades. The most…I. I. Mazin, R. E. Cohen·Apr 10, 1996SaveLearn
Higher-Order Results for the Relation between Channel Conductance and the Coulomb Blockade for Two Tunnel-Coupled Quantum DotsWe extend earlier results on the relation between the dimensionless tunneling channel conductance g and the fractional Coulomb blockade peak splitting f for two electrostatically equivalent dots…John M. Golden, Bertrand I. Halperin·Apr 10, 1996SaveLearn
Randomly Crosslinked Macromolecular Systems: Vulcanisation Transition to and Properties of the Amorphous Solid StateAs Charles Goodyear discovered in 1839, when he first vulcanised rubber, a macromolecular liquid is transformed into a solid when a sufficient density of permanent crosslinks is introduced at random.…Paul M. Goldbart, Horacio E. Castillo, Annette Zippelius·Apr 10, 1996SaveLearn
Electrostatics of Vortices in Type II SuperconductorsIn a type II superconductor the gap variation in the core of a vortex line induces a local charge modulation. Accounting for metallic screening, we determine the line charge of individual vortices…Gianni Blatter, Mikhail Feigel'man, Vadim Geshkenbein et al.·Apr 10, 1996SaveLearn
Diagrammatic method of integration over the unitary group, with applications to quantum transport in mesoscopic systemsA diagrammatic method is presented for averaging over the circular ensemble of random-matrix theory. The method is applied to phase-coherent conduction through a chaotic cavity (a ``quantum…P. W. Brouwer, C. W. J. Beenakker·Apr 10, 1996SaveLearn
Induced superconductivity distinguishes chaotic from integrable billiardsRandom-matrix theory is used to show that the proximity to a superconductor opens a gap in the excitation spectrum of an electron gas confined to a billiard with a chaotic classical dynamics. In…J. A. Melsen, P. W. Brouwer, K. M. Frahm et al.·Apr 10, 1996SaveLearn