Magnetoresistance in La(1-x)SrxCoO3 for 0.05 - x - 0.25The dc resistivity, magnetoresistance and magnetic susceptibility of La(1-x)SrxCoO3 compounds have been investigated in the temperature range of 4K to 300K for magnetic fields up to 7 T. In the…Vladimir Golovanov, Laszlo Mihaly, A. R. Moodenbaugh·Sep 27, 1996SaveLearn
Single-Electron Traps: A Quantitative Comparison of Theory and ExperimentWe have carried out a coordinated experimental and theoretical study of single-electron traps based on submicron aluminum islands and aluminum oxide tunnel junctions. The results of geometrical…K. A. Matsuoka, K. K. Likharev, P. Dresselhaus et al.·Sep 27, 1996SaveLearn
On the Kraichnan Model of Passive Scalar Advection Near the Batchelor limitThe third order correlation function of the scalar field advected by a Gaussian random velocity, with a spatial scaling exponent 2 - ε, and in the presence of a mean gradient, is calculated…Alain Pumir, Boris I. Shraiman, Eric D. Siggia·Sep 27, 1996SaveLearn
Relaxation processes and entropic traps in the Backgammon modelWe examine the density-density correlation function in a model recently proposed to study the effect of entropy barriers in glassy dynamics. We find that the relaxation proceeds in two steps with a…Silvio Franz, Felix Ritort·Sep 27, 1996SaveLearn
Shell structure and electron-electron interaction in self-assembled InAs quantum dotsUsing far-infrared spectroscopy, we investigate the excitations of self-organized InAs quantum dots as a function of the electron number per dot, 1<n<6, which is monitored in situ by capacitance…M. Fricke, A. Lorke, J. P. Kotthaus et al.·Sep 27, 1996SaveLearn
Thermal excitations of frustated XY spins in two dimensionsWe present a new variational approach to the study of phase transitions in frustrated 2D XY models. In the spirit of Villain's approach for the ferromagnetic case we divide thermal excitations…M. Benakli, H. Zheng, M. Gabay·Sep 27, 1996SaveLearn
Single-electron charging of self-assembled InAs quantum dotsThe many-particle ground state and excitations of self-assembled InAs quantum dots are investigated using far-infrared (FIR) and capacitance spectroscopy. The contributions of quantization and…M. Fricke, A. Lorke, M. Haslinger et al.·Sep 27, 1996SaveLearn
Energy gap in superconducting fullerides: optical and tunneling studiesTunneling and optical transmission studies have been performed on superconducting samples of Rb3C60. At temperatures much below the superconducting transition temperature Tc the energy gap is 2…Daniel Koller, Michael C. Martin, Laszlo Mihaly et al.·Sep 27, 1996SaveLearn
Far-infrared and capacitance spectroscopy of self-assembled InAs quantum dotsWe review a number of recent experiments which are probing ground state and excitations of few-electron systems in self-assembled InAs quantum dots. Far-infrared spectroscopy, together with local as…A. Lorke, M. Fricke, B. T. Miller et al.·Sep 27, 1996SaveLearn
Dynamical critical behavior in the integer quantum Hall effectWe investigate dynamical scaling properties in the integer quantum Hall effect for non-interacting electrons at zero temperature, by means of the frequency-induced peak broadening of the dissipative…Y. Avishai, J. M. Luck·Sep 27, 1996SaveLearn
Density Profiles in Random Quantum Spin ChainsWe consider random transverse-field Ising spin chains and study the magnetization and the energy-density profiles by numerically exact calculations in rather large finite systems (L 128). Using…F. Igloi, H. Rieger·Sep 27, 1996SaveLearn
Integrable impurity in the supersymmetric t-J modelAn impurity coupling to both spin and charge degrees of freedom is added to a periodic t-J chain such that its interaction with the bulk can be varied continuously without losing integrability.…Gerald Bedürftig, Fabian H. L. Eßler, Holger Frahm·Sep 27, 1996SaveLearn
Orientational order in dipolar fluids consisting of nonspherical hard particlesWe investigate fluids of dipolar hard particles by a certain variant of density-functional theory. The proper treatment of the long range of the dipolar interactions yields a contribution to the free…B. Groh, S. Dietrich·Sep 27, 1996SaveLearn
Electron Correlation and Charge Transfer Instability in Bilayered Two Dimensional Electron GasWe prove that the predicted charge transfer state in symmetric bilayers of two dimensional electron gases is always unstable at zero bias voltage, due to interlayer correlation and/or tunneling. This…Sergio Conti, Gaetano Senatore·Sep 27, 1996SaveLearn
One particle spectral weight of the three dimensional single band Hubbard modelDynamic properties of the three-dimensional single-band Hubbard model are studied using Quantum Monte Carlo combined with the maximum entropy technique. At half-filling, there is a clear gap in the…M. Ulmke, R. T. Scalettar, A. Nazarenko et al.·Sep 26, 1996SaveLearn
Acousto-optic effects of surface acoustic waves in semiconductor quantum well structuresWe report on recent experiments investigating the modification of the inter-band optical response of a piezoelectric semiconductor quantum well structure under the influence of intense short period…C. Rocke, A. Wixforth, J. P. Kotthaus et al.·Sep 26, 1996SaveLearn
Voltage-probe and imaginary potential models for dephasing in a chaotic quantum dotWe compare two widely used models for dephasing in a chaotic quantum dot: The introduction of a fictitious voltage probe into the scattering matrix and the addition of an imaginary potential to the…P. W. Brouwer, C. W. J. Beenakker·Sep 26, 1996SaveLearn
Yangian Symmetry and Quantum Inverse Scattering Method for the One-Dimensional Hubbard ModelWe develop the quantum inverse scattering method for the one-dimensional Hubbard model on the infinite interval at zero density. R-matrix and monodromy matrix are obtained as limits from their…Shuichi Murakami, Frank Göhmann·Sep 26, 1996SaveLearn
Phase Transitions of the Flux Line Lattice in High-Temperature Superconductors with Weak Columnar and Point DisorderWe study the effects of weak columnar and point disorder on the vortex-lattice phase transitions in high temperature superconductors. The combined effect of thermal fluctuations and of quenched…Yadin Y. Goldschmidt·Sep 26, 1996SaveLearn
Ground state and excited states of a trapped dilute condensed Bose gasI review recent theoretical treatments of a dilute interacting condensed Bose gas in a trap. Bogoliubov's classic results for a uniform condensate are generalized to include the effect of a trap,…Alexander L. Fetter·Sep 26, 1996SaveLearn
On the Normal State of the High Temperature SuperconductorsBased on a Fermi liquid model, we present several results on the normal state of the optimally doped and overdoped cuprate superconductors. Our main result is an analytic demonstration, backed by…George Kastrinakis·Sep 26, 1996SaveLearn
Topological equivalence of tilingsWe introduce a notion of equivalence on tilings which is formulated in terms of their local structure. We compare it with the known concept of locally deriving one tiling from another and show that…Johannes Kellendonk·Sep 26, 1996SaveLearn
Ferromagnetism in the two dimensional t-t' Hubbard model at the Van Hove densityUsing an improved version of the projection quantum Monte Carlo technique, we study the square-lattice Hubbard model with nearest-neighbor hopping t and next-nearest-neighbor hopping t', by…R. Hlubina, S. Sorella, F. Guinea·Sep 26, 1996SaveLearn
Integer and fractional charge solitons in modulated strips in the fractional quantum Hall regimeWe propose the existence and study the solitonic excitations in two kinds of samples in the fractional quantum Hall regime. One is a strip modulated by a one-dimensional array of gates. The other is…Eshel Ben-Jacob, Francisco Guinea, Ziv Hermon et al.·Sep 26, 1996SaveLearn
Microscopic Derivation of the Ginzburg-Landau Equations for a d-wave SuperconductorThe Ginzburg-Landau (GL) equations for a d-wave superconductor are derived within the context of two microscopic lattice models used to describe the cuprates: the extended Hubbard model and the…D. L. Feder, C. Kallin·Sep 26, 1996SaveLearn