Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Transport: Poster Session
TT 22.52: Poster
Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B
Fluctuation Correction to Andreev Transport — •Fabian Mohn1, Wolfgang Belzig1, and Yuli V. Nazarov2 — 1Fachbereich Physik, Universität Konstanz, D-78457 Konstanz — 2Kavli Institute of Nanoscience, Delft University of Technology, The Netherlands
The quantum mechanical nature of electronic transport at low temperatures is reflected in fluctuations of physical properties due to wave interference in a disordered environment. The superconducting proximity effect describes the superconductivity in the normal parts of a heterostructure induced by the presence of a superconductor and is a consequence of the macroscopic phase coherence. Studying the interplay between this macroscopic interference and the microscopic interference underlying mesoscopic fluctuations is of fundamental interest.
Recently a method to treat quantum corrections to the circuit theory in normal metals was developed by Campagnano and Nazarov [1]. The circuit theory of mesoscopic transport provides an efficient and controlled way to include e.g. superconducting and spin-transport properties. We generalize the method to include superconducting terminals and use it to investigate the quantum corrections to the proximity density of states and the Andreev conductance.
[1] G. Campagnano and Yu. V. Nazarov, Phys. Rev. B 74, 125307 (2006)