Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1996-05-02
"Quantum Transport in Semiconductor Submicron Structures", edited by B. Kramer (Kluwer Academic Press, AA Dordrecht, 1995)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 3 Figures, crckapb style. The paper has not been changed, but replaced to solve technical problems
Scientific paper
Transport through a one-dimensional wire of interacting electrons connected to semi infinite leads is investigated using a bosonization approach. The dynamic nonlocal conductivity is rigorously expressed in terms of the transmission. For abrupt variations of the interaction parameters at the junctions, an incident electron is transmitted as a sequence of partial charges: the central wire acts as a Fabry-P\'erot resonator. The dc conductance is shown to be given by the total transmission which turns out to be perfect. When the wire has a tendency towards superconducting order, partial Andreev reflection of an incident electron occurs. Finally, we study the role of a weak barrier at one contact or inside the wire by a renormalization group method at finite temperature. We compute the conductance in the presence of localized or extended disorder, and compare our results to recent experiments on quantum wires.
Safi Ines
Schulz H. J.
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