10,644 research outputs found

    Re-entrant localization of single particle transport in disordered Andreev wires

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    We study effects of disorder on the low energy single particle transport in a normal wire surrounded by a superconductor. We show that the heat conductance includes the Andreev diffusion decreasing with increase in the mean free path â„“\ell and the diffusive drift produced by a small particle-hole asymmetry, which increases with increasing â„“\ell. The conductance thus has a minimum as a function of â„“\ell which leads to a peculiar re-entrant localization as a function of the mean free path.Comment: 4 pages, 2 figure

    Hydrodynamic description of transport in strongly correlated electron systems

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    We develop a hydrodynamic description of the resistivity and magnetoresistance of an electron liquid in a smooth disorder potential. This approach is valid when the electron-electron scattering length is sufficiently short. In a broad range of temperatures, the dissipation is dominated by heat fluxes in the electron fluid, and the resistivity is inversely proportional to the thermal conductivity, κ\kappa. This is in striking contrast with the Stokes flow, in which the resistance is independent of κ\kappa and proportional to the fluid viscosity. We also identify a new hydrodynamic mechanism of spin magnetoresistance

    Growth of solid hcp \^4He off the melting curve

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    We report studies of the growth of solid hcp \4he at pressures higher than the bulk freezing pressure using a cell design that allows us to inject atoms into the solid. Near the melting curve during injection we observe random events during which the pressure recorded in the cell drops abruptly. These events are accompanied by transient increases in the temperature of the cell. We discuss these transients and conclude that they represent the solidification of meta-stable liquid regions and the associated relief of strain in the local solid. We also observe that further from the melting curve the transients are no longer recorded, but that we can continue to add atoms to the solid, increasing its density at fixed volume. We document these changes in density with respect to changes in the chemical potential as a function of temperature and discuss these in the context of recent theoretical work.Comment: 7 pages, 8 figure

    Projected Three-Pion Correlation Functions

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    We propose a new procedure for constructing projected three-pion correlation functions which reduces undesirable artificial momentum dependences resulting from the commonly used procedure and facilitates comparison of three-pion correlation data with theoretical models.Comment: 6 pages revtex, incl. 1 figure. Submitted as Brief Report to Physical Review C. Normalization error and typos correcte
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