H2 in the interstitial channels of nanotube bundlesThe equation of state of H2 adsorbed in the interstitial channels of a carbon nanotube bundle has been calculated using the diffusion Monte Carlo method. The possibility of a lattice dilation,…M. C. Gordillo, J. Boronat, J. Casulleras·Jul 16, 2003SaveLearn
Time-dependent Gross-Pitaevskii equation for composite bosons as the strong-coupling limit of the fermionic BCS-RPA approximationThe linear response to a space- and time-dependent external disturbance of a system of dilute condensed composite bosons at zero temperature, as obtained from the linearized version of the…G. C. Strinati, P. Pieri·Jul 16, 2003SaveLearn
Molecular size dependence of field effect in organic single crystalsWe explore the effect of molecular size on injected carrier transport. We have fabricated and characterized field effect transistors (FETs) on optically transparent single crystals of tetracene, the…V. Y. Butko, X. Chi, A. P. Ramirez·Jul 15, 2003SaveLearn
Tuning the interactions of spin-polarized fermions using quasi-one-dimensional confinementThe behavior of ultracold atomic gases depends crucially on the two-body scattering properties of these systems. We develop a multichannel scattering theory for atom-atom collisions in…Brian E. Granger, D. Blume·Jul 15, 2003SaveLearn
Raman spectroscopy on carbon nanotubes at high pressureRaman spectroscopy has been the most extensively employed method to study carbon nanotubes at high pressures. This review covers reversible pressure-induced changes of the lattice dynamics and…I. Loa·Jul 15, 2003SaveLearn
Three Dimensional Simulation of Jet Formation in Collapsing CondensatesWe numerically study the behavior of collapsing and exploding condensates using the parameters of the experiments by E.A. Donley et al. [Nature, 412, 295, (2001)]. Our studies are based on a full…Weizhu Bao, D. Jaksch, P. A. Markowich·Jul 15, 2003SaveLearn
Modes of speciation in heterogeneous spaceModes of speciation have been the subject of a century's debate. Traditionally, most speciations are believed to be caused by spatial separation of populations (allopatry). Recent observations…Martin Rost, Michael Lässig·Jul 15, 2003SaveLearn
Kondo lattice model with a direct exchange interaction between localized momentsWe study the Kondo lattice model with a direct antiferromagnetic exchange interaction between localized moments. Ferromagnetically long-range ordered state coexisting with the Kondo screening shows a…Mun Dae Kim, Chul Koo Kim, Jongbae Hong·Jul 14, 2003SaveLearn
Interference of atomic levels and superfluid -- Mott insulator phase transition in a two-component Bose-Einstein condensateThe superfluid -- Mott insulator phase transition in a Bose-Einstein condensate of neutral atoms with doubly degenerate internal ground states in an optical lattice is theoretically investigated. The…K. V. Krutitsky, R. Graham·Jul 11, 2003SaveLearn
Comment on: 'Depolarization corrections to the coercive field in thin-film ferroelectrics'The Letter by Dawber et al. [J. Phys.: Condens. Matter 15 L393 (2003)] notes that incomplete screening in the electrodes of a ferroelectric capacitor can result in an underestimate for the true…Stephen Ducharme, Vladimir Fridkin·Jul 11, 2003SaveLearn
Bragg spectroscopy with an accelerating Bose-Einstein condensateWe present the results of Bragg spectroscopy performed on an accelerating Bose-Einstein condensate. The Bose condensate undergoes circular micro-motion in a magnetic TOP trap and the effect of this…R. Geursen, N. R. Thomas, A. C. Wilson·Jul 10, 2003SaveLearn
Capping-induced suppression of annealing in Ga(1-x)Mn(x)As epilayersWe have studied the effects of capping ferromagnetic Ga(1-x)Mn(x)As epilayers with a thin layer of undoped GaAs, and we find that even a few monolayers of GaAs have a significant effect on the…M. B. Stone, K. C. Ku, S. J. Potashnik et al.·Jul 10, 2003SaveLearn
One-dimensional behavior of elongated Bose-Einstein condensatesWe study the properties of elongated Bose-Einstein condensates. First, we show that the dimensions of the condensate after expansion differs from the 3D Thomas-Fermi regime. We also study the…P. Bouyer, J. H. Thywissen, F. Gerbier et al.·Jul 10, 2003SaveLearn
The response of Bose-Einstein condensates to external perturbations at finite temperatureWe present a theory of the linear response of a Bose-condensed gas to external perturbations at finite temperature. The theory developed here is the basis of a recent quantitative explanation of the…S. A. Morgan·Jul 10, 2003SaveLearn
Vortex behavior near a spin vacancy in 2D XY-magnetsThe dynamical behavior of anisotropic two dimensional Heisenberg models is still a matter of controversy. The existence of a central peak at all temperatures and a rich structure of magnon peaks are…A. R. Pereira, L. A. S. Mol, S. A. Leonel et al.·Jul 10, 2003SaveLearn
Effect of a columnar defect on the shape of slow-combustion frontsWe report experimental results for the behavior of slow-combustion fronts in the presence of a columnar defect with excess or reduced driving, and compare them with those of mean-field theory. We…M. Myllys, J. Maunuksela, J. Merikoski et al.·Jul 10, 2003SaveLearn
History-dependent relaxation and the energy scale of correlation in the Electron-GlassWe present an experimental study of the energy-relaxation in Anderson-insulating indium-oxide films excited far from equilibrium. In particular, we focus on the effects of history on the relaxation…Z. Ovadyahu, M. Pollak·Jul 10, 2003SaveLearn
The critical temperature of a trapped, weakly interacting Bose gasWe report on measurements of the critical temperature of a harmonically trapped, weakly interacting Bose gas as a function of atom number. Our results exclude ideal-gas behavior by more than two…Fabrice Gerbier, Joseph H. Thywissen, Simon Richard et al.·Jul 9, 2003SaveLearn
Dephasing of entangled electron-hole pairs in a degenerate electron gasA tunnel barrier in a degenerate electron gas was recently discovered as a source of entangled electron-hole pairs. Here, we investigate the loss of entanglement by dephasing. We calculate both the…J. L. van Velsen, M. Kindermann, C. W. J. Beenakker·Jul 9, 2003SaveLearn
Effectively attractive Bose-Einstein condensates in a rotating toroidal trapWe examine an effectively attractive quasi-one-dimensional Bose-Einstein condensate of atoms confined in a rotating toroidal trap, as the magnitude of the coupling constant and the rotational…G. M. Kavoulakis·Jul 8, 2003SaveLearn
Bound state of dimers on a spherical surfaceThe study of particle motion on spherical surfaces is relevant to adsorption on buckyballs and other solid particles. This paper reports results for the binding energy of such dimers, consisting of…M. K. Kostov, E. S. Hernandez, M. W. Cole·Jul 7, 2003SaveLearn
Solitons and deformed lattices IWe study a model describing some aspects of the dynamics of biopolymers. The models involve either one or two finite chains with a number N of sites that represent the "units" of a…Betti Hartmann, Wojtek J. Zakrzewski·Jul 7, 2003SaveLearn
Dynamics of zz spin correlations in the square-lattice spin-1/2 isotropic XY modelUsing the Jordan-Wigner fermionization in two dimensions we obtain the zz wave vector- and frequency-dependent structure factor for the spin-1/2 isotropic XY model on a spatially anisotropic square…Oleg Derzhko, Taras Krokhmalskii·Jul 5, 2003SaveLearn
Electronic and magnetic properties of GaMnAs: Annealing effectsThe effect of short-time and long-time annealing at 250C on the conductivity, hole density, and Curie temperature of GaMnAs single layers and GaMnAs/InGaMnAs heterostructures is studied by in-situ…W. Limmer, A. Koeder, S. Frank et al.·Jul 4, 2003SaveLearn
Electro-Reflectance Spectra of Blue BronzeWe show that the infrared reflectance of the quasi-one dimensional charge-density-wave (CDW) conductor K0.3MoO3 (blue bronze) varies with position when a voltage greater than the CDW depinning…R. C. Rai, V. A. Bondarenko, J. W. Brill·Jul 3, 2003SaveLearn