959 research outputs found
Shot noise and Coulomb effects on non-local electron transport in normal-superconducting-normal heterostructures
We argue that Coulomb interaction can strongly influence non-local electron
transport in normal-superconducting-normal structures and emphasize direct
relation between Coulomb effects and non-local shot noise. In the tunneling
limit non-local differential conductance is found to have an S-like shape and
can turn negative at non-zero bias. At high transmissions crossed Andreev
reflection yields positive noise cross-correlations and Coulomb anti-blockade
of non-local electron transport.Comment: 8 pages, 2 figures. Published versio
Weak localization in a system with a barrier: Dephasing and weak Coulomb blockade
We non-perturbatively analyze the effect of electron-electron interactions on
weak localization (WL) in relatively short metallic conductors with a tunnel
barrier. We demonstrate that the main effect of interactions is electron
dephasing which persists down to T=0 and yields suppression of WL correction to
conductance below its non-interacting value. Our results may account for recent
observations of low temperature saturation of the electron decoherence time in
quantum dots.Comment: published version, 10 page
Transport of interacting electrons in arrays of quantum dots and diffusive wires
We develop a detailed theoretical investigation of the effect of Coulomb
interaction on electron transport in arrays of chaotic quantum dots and
diffusive metallic wires. Employing the real time path integral technique we
formulate a new Langevin-type of approach which exploits a direct relation
between shot noise and interaction effects in mesoscopic conductors. With the
aid of this approach we establish a general expression for the Fano factor of
1D quantum dot arrays and derive a complete formula for the interaction
correction to the current which embraces all perturbative results previously
obtained for various quasi-0D and quasi-1D disordered conductors and extends
these results to yet unexplored regimes.Comment: 12 pages, 2 figure
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