Delocalization of Wannier-Stark ladders by phonons: tunneling and stretched polaronsWe study the coherent dynamics of a Holstein polaron in strong electric fields. A detailed analytical and numerical analysis shows that even for small hopping constant and weak electron-phonon…Wei Zhang, Alexander O. Govorov, Sergio E. Ulloa·Jul 8, 2002SaveLearn
The Kondo state in quantum point contacts and the local moment in semiconductor quantum dots - two sides of the same phenomenonThis is a three step work: i) we explain why quantum point contacts are similar to ballistic quantum dots; ii) we introduce the virtual Kondo state in both systems; iii-1st) this state explains 0.7…Daniel L. Miller·Jul 8, 2002SaveLearn
Exactly solvable models through the generalized empty interval method, for multi-species interactionsMulti-species reaction-diffusion systems, with nearest-neighbor interaction on a one-dimensional lattice are considered. Necessary and sufficient constraints on the interaction rates are obtained,…Amir Aghamohammadi, Masoud Alimohammadi, Mohammad Khorrami·Jul 6, 2002SaveLearn
Resonance Quantum GateSimplest models of two- and three-terminal Quantum Quantum Gates are suggested in form of a quantum ring with few one-dimensional quantum wires attached to it and several point-wise govering…S. Avdonin, N. Bagraev, A. Mikhailova et al.·Jul 6, 2002SaveLearn
Square-lattice s=1/2 XY model and the Jordan-Wigner fermions: The ground-state and thermodynamic propertiesUsing the 2D Jordan-Wigner transformation we reformulate the square-lattice s=1/2 XY (XZ) model in terms of noninteracting spinless fermions and examine the ground-state and thermodynamic properties…Oleg Derzhko, Taras Verkholyak, Reimar Schmidt et al.·Jul 6, 2002SaveLearn
On the statistics of resonances and non-orthogonal eigenfunctions in a model for single-channel chaotic scatteringWe describe analytical and numerical results on the statistical properties of complex eigenvalues and the corresponding non-orthogonal eigenvectors for non-Hermitian random matrices modeling…Y. V. Fyodorov, B. Mehlig·Jul 5, 2002SaveLearn
Superconductivity depression in ultrathin YBa2Cu3O7-x layers in La0.7Ca0.3MnO3 /YBa2Cu3O7-x superlatticesWe report on the depression of the superconducting critical temperature of ultra thin YBa2Cu3O7 (YBCO) layers, when their thickness is reduced in presence of La0.7Ca0.3MnO3 (LCMO) magnetic layers in…Z. Sefrioui, M. Varela, V. Pena et al.·Jul 5, 2002SaveLearn
Enhancement of the scissors mode of an expanding Bose-Einstein condensateWe study the time-evolution of the scissors mode of a Bose-Einstein condensate during the ballistic expansion after release from the magnetic trap. We show that despite the nontrivial character of…M. Modugno, G. Modugno, G. Roati et al.·Jul 5, 2002SaveLearn
Probing the local structure: macromolecular combs in external fieldsRecent experimental methods allow to monitor the response of macromolecules to locally applied fields, complementing usual, mesoscopic techniques. Based on the Rouse-model and its extension to…R. Burioni, D. Cassi, A. Blumen·Jul 5, 2002SaveLearn
Autonomous stochastic resonance in fully frustrated Josephson-junction laddersWe investigate autonomous stochastic resonance in fully frustrated Josephson-junction ladders, which are driven by uniform constant currents. At zero temperature large currents induce oscillations…Gun Sang Jeon, M. Y. Choi·Jul 5, 2002SaveLearn
Quantum diffusion of prices and profitsWe discuss the time evolution of quotations of stocks and commodities and show that corrections to the orthodox Bachelier model inspired by quantum mechanical time evolution of particles may be…E. W. Piotrowski, J. Sladkowski·Jul 4, 2002SaveLearn
Large N behavior of string solutions in the Heisenberg modelWe investigate the large N behavior of the complex solutions for the two magnon system in the S=1/2 Heisenberg XXZ model. The Bethe ansatz equations are numerically solved for the string solutions…T. Fujita, T. Kobayashi, H. Takahashi·Jul 4, 2002SaveLearn
Spin Tunneling in Magnetic Molecules: Quasisingular Perturbations and Discontinuous SU(2) InstantonsSpin coherent state path integrals with discontinuous semiclassical paths are investigated with special reference to a realistic model for the magnetic degrees of freedom in the Fe8 molecular solid.…Ersin Kececioglu, Anupam Garg·Jul 3, 2002SaveLearn
Sensitive Detection of Cold Cesium Molecules by Radiative Feshbach SpectroscopyWe observe the dynamic formation of Cs2 molecules near Feshbach resonances in a cold sample of atomic cesium using an external probe beam. This method is 300 times more sensitive than previous…Cheng Chin, Andrew J. Kerman, Vladan Vuletić et al.·Jul 3, 2002SaveLearn
Decay of an ultracold fermionic lithium gas near a Feshbach resonanceWe studied the magnetic field dependence of the inelastic decay of an ultracold, optically trapped 6-Li gas of different spin compositions. The spin mixture of the two lowest hyperfine states showed…K. Dieckmann, C. A. Stan, S. Gupta et al.·Jul 2, 2002SaveLearn
Conduction in molecular junctions: Inelastic effectsThe effect of a thermal environment on electron (or hole) transfer through molecular bridges and on the electron conduction properties of such bridges is studied. Our steady state formalism based on…Dvira Segal, Abraham Nitzan·Jul 2, 2002SaveLearn
From Cooper pairs to Luttinger liquids with bosonic atoms in optical latticesWe propose a scheme to observe typical strongly correlated fermionic phenomena with bosonic atoms in optical lattices. For different values of the sign and strength of the scattering lengths it is…B. Paredes, J. I. Cirac·Jul 1, 2002SaveLearn
Scattering of atoms on a Bose-Einstein condensateWe study the scattering properties of a Bose-Einstein condensate held in a finite depth well when the incoming particles are identical to the ones in the condensate. We calculate phase shifts and…Uffe V. Poulsen, Klaus Molmer·Jul 1, 2002SaveLearn
Imaging the Near FieldIn an earlier paper we introduced the concept of the perfect lens which focuses both near and far electromagnetic fields, hence attaining perfect resolution. Here we consider refinements of the…S. Anantha Ramakrishna, J. B. Pendry, M. C. K Wiltshire et al.·Jul 1, 2002SaveLearn
Traversal times for resonant tunnelingThe tunneling time of particle through given barrier is commonly defined in terms of "internal clocks" which effectively measure the interaction time with internal degrees of freedom of the…Uri Peskin, Michael Galperin, Abraham Nitzan·Jun 30, 2002SaveLearn
Numerical simulations of electron tunneling currents in waterThis paper presents results of numerical simulations of electron tunneling through water that extend our previous calculations on such systems in several ways. First, a tip-substrate configuration is…Michael Galperin, Abraham Nitzan, Ilan Benjamin·Jun 30, 2002SaveLearn
Heating in current carrying molecular junctionsA framework for estimating heating and expected temperature rise in current carrying molecular junctions is described. Our approach is based on applying the Redfield approximation to a tight binding…Dvira Segal, Abraham Nitzan·Jun 30, 2002SaveLearn
Electromagnetic Surface Modes at Interfaces with Negative Refractive Index make a "Not-Quite-Perfect" LensInterfaces between media with negative relative refractive index generically support propagating electromagnetic surface polariton modes with large wavenumber. The relation of these modes to a recent…F. D. M. Haldane·Jun 29, 2002SaveLearn
Towards a Tetravalent Chemistry of ColloidsWe propose coating spherical particles or droplets with anisotropic nano-sized objects to allow micron-scale colloids to link or functionalize with a four-fold valence, similar to the sp3 hybridized…David R. Nelson·Jun 28, 2002SaveLearn
Influence of internal disorder on the superconducting state in the organic layered superconductor kappa-(BEDT-TTF)2Cu[N(CN)2]BrWe report high-sensitivity AC susceptibility measurements of the penetration depth in the Meissner state of the layered organic superconductor kappa-(BEDT-TTF)2Cu[N(CN)2]Br. We have studied nominally…M. Pinteric, S. Tomic, M. Prester et al.·Jun 28, 2002SaveLearn