9,544 research outputs found
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
Strong Tunneling and Coulomb Blockade in a Single-Electron Transistor
We have developed a detailed experimental study of a single-electron
transistor in a strong tunneling regime. Although weakened by strong charge
fluctuations, Coulomb effects were found to persist in all samples including
one with the effective conductance 8 times higher than the quantum value (6.45
k). A good agreement between our experimental data and
theoretical results for the strong tunneling limit is found. A reliable
operation of transistors with conductances 3-4 times larger than the quantum
value is demonstrated.Comment: revtex, 4 page
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
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