Vortex-loops and solid nucleation in superfluid 4He and 3HeWe propose a new model for the nature of the nucleation of solid from the superfluid phases of 4He and 3He. Unique to the superfluid phases the solid nucleation involves an extremely fast…Nir Gov·Aug 20, 2001SaveLearn
Scaling of the buckling transition of ridges in thin sheetsWhen a thin elastic sheet crumples, the elastic energy condenses into a network of folding lines and point vertices. These folds and vertices have elastic energy densities much greater than the…Brian DiDonna·Aug 20, 2001SaveLearn
Optical Pumping in Ferromagnet-Semiconductor Heterostructures: Magneto-optics and Spin TransportEpitaxial ferromagnetic metal - semiconductor heterostructures are investigated using polarization-dependent electroabsorption measurements on GaAs p-type and n-type Schottky diodes with embedded…A. F. Isakovic, D. M. Carr, J. Strand et al.·Aug 19, 2001SaveLearn
Double exchange model for RuSr2(Eu,Gd)Cu2O8We propose a double exchange model to describe the RuO2 planes of RuSr2(Eu,Gd)Cu2O8. The Ru+5 ions are described by localized spins, and additional electrons provided by the superconducting…H. Aliaga, A. A. Aligia·Aug 17, 2001SaveLearn
Magnetic polarons in Ca(1-x)YxMnO3Experimental evidence show that in the magnetoresistive manganite Ca(1-x) YxMnO3, ferromagnetic (FM) polarons arises in an antiferromagnetic (AF) background, as a result of the doping with…H. Aliaga, M. T. Causa, M. Tovar et al.·Aug 17, 2001SaveLearn
Can crack front waves explain the roughness of cracks ?We review recent theoretical progress on the dynamics of brittle crack fronts and its relationship to the roughness of fracture surfaces. We discuss the possibility that the intermediate scale…E. Bouchaud, J-P Bouchaud, D. S. Fisher et al.·Aug 16, 2001SaveLearn
Identifying and Indexing Icosahedral Quasicrystals from Powder Diffraction PatternsWe present a scheme to identify quasicrystals based on powder diffraction data and to provide a standardized indexing. We apply our scheme to a large catalog of powder diffraction patterns, including…Peter J. Lu, Kenneth Deffeyes, Paul J. Steinhardt et al.·Aug 16, 2001SaveLearn
Electronic structure of the pyrochlore metals Cd2Os2O7 and Cd2Re2O7First principles density functional calculations within the local spin density approximation (LSDA) and the generalized gradient approximation (GGA) are reported for pyrochlore Cd2Os2O7 and…D. J. Singh, P. Blaha, K. Schwarz et al.·Aug 14, 2001SaveLearn
Hole Mobility And Scattering Mechanism on Undoped MOCVD Grown of GaSbThe temperature variation of partial mobility and effective mobility for undoped p-GaSb have been calculated using Matthiessen rule. The effective mobility depends on the ionized, acoustic, polar…Altje Latununuwe, Pepen Arifin, Euis Sustini et al.·Aug 14, 2001SaveLearn
Ground State Pressure and Energy Density of a Homogeneous Bose Gas in Two DimensionsWe consider an interacting homogeneous Bose gas at zero temperature in two spatial dimensions. The properties of the system can be calculated as an expansion in powers of g, where g is the coupling…Jens O. Andersen·Aug 13, 2001SaveLearn
On Ground State Tunneling in Mn12-AcetateWe report Hall sensor measurements of the magnetic relaxation of Mn12-acetate as a function of magnetic field applied along the easy axis of magnetization for a series of closely-spaced…K. M. Mertes, M. P. Sarachik, Y. Paltiel et al.·Aug 10, 2001SaveLearn
Comparison of two non-primitive methods for path integral simulations: Higher-order corrections vs. an effective propagator approachTwo methods are compared that are used in path integral simulations. Both methods aim to achieve faster convergence to the quantum limit than the so-called primitive algorithm (PA). One method,…Florian R. Krajewski, Martin H. Muser·Aug 10, 2001SaveLearn
Consistent refinement of Bethe strings for spin and electron models and a new non-Bethe solutionWell known Bethe strings in spin chains, delta-electron gas, Hubbard and t-J models are shown to be imprecise, while their consisten refinement along with a new non-Bethe r-string are discovered.…Anjan Kundu·Aug 10, 2001SaveLearn
Thermodynamics of Two Dimensional Magnetic NanoparticlesA two dimensional magnetic particle in the presence of an external magnetic field is studied. Equilibrium thermodynamical properties are derived by evaluating analytically the partition function.…P. Vargas, D. Altbir, M. Knobel et al.·Aug 10, 2001SaveLearn
Magnetism and Electronic Structure in ZnFe2O4 and MnFe2O4Density functional calculations are used to study magnetic and electronic properties of the spinel ferrites, ZnFe2O4 and MnFe2O4. Correct magnetic orderings are obtained. ZnFe2O4 is…D. J. Singh, M. Gupta, R. Gupta·Aug 10, 2001SaveLearn
Freezing transitions and the density of states of 2D random Dirac HamiltoniansUsing an exact mapping to disordered Coulomb gases, we introduce a novel method to study two dimensional Dirac fermions with quenched disorder in two dimensions which allows to treat non perturbative…Baruch Horovitz, Pierre Le Doussal·Aug 8, 2001SaveLearn
Symmetries in jump-diffusion models with applications in option pricing and credit riskIt is a well known fact that local scale invariance plays a fundamental role in the theory of derivative pricing. Specific applications of this principle have been used quite often under the name of…Jiri Hoogland, Dimitri Neumann, Michel Vellekoop·Aug 8, 2001SaveLearn
Edge-state effects on the magneto-polarizability of nanographite layersThe possibility for carbon materials such as activated carbon fibers or graphite ribbons, to support edge-states could change drastically their magnetic properties. The purpose of this work is to…S. Pleutin, A. A. Ovchinnikov·Aug 8, 2001SaveLearn
Static magneto-polarizability of cylindrical nanostructuresThe static polarizability of cylindrical systems is shown to have a strong dependence on a uniform magnetic field applied parallel to the tube axis. This dependence is demonstrated by performing…S. Pleutin, A. A. Ovchinnikov·Aug 8, 2001SaveLearn
A vortex description of the first-order phase transition in type-I superconductorsUsing both analytical arguments and detailed numerical evidence we show that the first order transition in the type-I 2D Abelian Higgs model can be understood in terms of the statistical mechanics of…Luis M. A. Bettencourt, Greg J. Stephens·Aug 7, 2001SaveLearn
Maximum occupation number for composite boson statesOne of the major differences between fermions and bosons is that fermionic states have a maximum occupation number of one, whereas the occupation number for bosonic states is in principle unlimited.…Stefan Rombouts, Dimitri Van Neck, Karel Peirs et al.·Aug 6, 2001SaveLearn
Singularity in the boundary resistance between superfluid 4He and a solid surfaceWe report new measurements in four cells of the thermal boundary resistance R between copper and 4He below but near the superfluid-transition temperature Tλ. For $10-7 ≤ t 1 -…Kerry Kuehn, Sarabjit Mehta, Haiying Fu et al.·Aug 4, 2001SaveLearn
Signatures of the correlation hole in total and partial cross sectionsIn a complex scattering system with few open channels, say a quantum dot with leads, the correlation properties of the poles of the scattering matrix are most directly related to the internal…T. Gorin, T. H. Seligman·Aug 3, 2001SaveLearn
Some Statistical Physics Approaches for Trends and Predictions in MeteorologySpecific aspects of time series analysis are discussed. They are related to the analysis of atmospheric data that are pertinent to clouds. A brief introduction on some of the most interesting topics…K. Ivanova, M. Ausloos, T. Ackerman et al.·Aug 3, 2001SaveLearn
Quasi 2D Bose-Einstein condensation in an optical latticeWe study the phase transition of a gas of Rb atoms to quantum degeneracy in the combined potential of a harmonically confining magnetic trap and the periodic potential of an optical lattice. For high…S. Burger, F. S. Cataliotti, C. Fort et al.·Aug 2, 2001SaveLearn