Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.36: Poster

Montag, 27. März 2006, 14:00–17:45, P1

Interaction corrections in Andreev reflection processes — •Markus Müller and Wolfgang Belzig — Universität Konstanz, Fachbereich Physik, D-78457 Konstanz, Germany

Understanding the conductance properties is of elementary interest when investigating electronic transport in nanostructures. We focus on the junction between a conventional superconductor and a normal metal. We consider a system of a one-dimensional weakly interacting electron gas on one and a superconductor on the other side, separated by a single potential localized in the interface region. Due to electron-electron interaction the Andreev reflection amplitudes are modified. A Poor Man’s renormalization group procedure is used to handle logarithmic divergencies appearing in a perturbative treatment. Our approach is similar to the studies of conduction of a weakly interacting one-dimensional electron gas through a single barrier, realized by Matveev, Yue, and Glazman [Phys. Rev. Lett. 71, 3351 (1993)]. The renormalized Andreev reflection amplitudes are calculated for any energy, and interface potentials of arbitrary strength. We discuss the temperature and voltage dependence of the Andreev conductance and compare with experimental results found by Morpurgo et al. [Science 286, 263 (1999)]