Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.12: Poster

Montag, 11. März 2013, 15:00–19:00, Poster D

Dynamical Coulomb blockade of the nonlocal conductance in normalmetal/superconductor hybrid structures — •Stefan Kolenda, Michael J. Wolf, and Detlef Beckmann — Institut für Nanotechnologie, KIT, 76021 Karlsruhe, Germany

In normalmetal/superconductor hybrid structures nonlocal conductance is determined by crossed Andreev reflection (CAR) and elastic cotunneling (EC). This was investigated recently both experimentally and theoretically ([1], [2] and references therein). Dynamical Coulomb blockade of EC and CAR was predicted theoretically in [2]. Here we report on experimental investigations of these effects. We found signatures of dynamical Coulomb blockade in local and nonlocal conductance in the normal state. In the superconducting state, we find s-shaped nonlocal differential conductance curves as a function of bias applied on both contacts, as predicted in [2]. These curves were observed for bias voltages both below and above the gap. We compare our results to theory.
[1] J. Brauer et al., Phys. Rev. B 81, 024515 (2010)
D.S. Golubev and A.D. Zaikin, Phys. Rev. B 82, 134508 (2010)