Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.45: Poster
Monday, March 31, 2014, 15:00–19:00, P2
Nonlocal transport and heating in superconductors under dual-bias conditions — •Stefan Kolenda1, Michael J. Wolf1, Dimitrij S. Golubev1,2, Andrei Zaikin1,3,4, and Detlef Beckmann1 — 1Institut für Nanotechnologie, Karlsruher Institut für Technologie — 2Low Temperature Laboratory (OVLL), Aalto University School of Science — 3I. E. Tamm Department of Theoretical Physics, P. N. Lebedev Physics Institute, Moscow — 4Laboratory of Cryogenic Nanoelectronics, Nizhny Novgorod State Technical University
We report on an experimental study of nonlocal transport in superconductor hybrid structures,
where two normal-metal leads are attached to a central superconducting wire. Structures of this kind are of interest, since possibly they could serve as
Cooper pair splitters, creating spin entangled electrons. With bias voltages below the gap we find
s-shaped nonlocal conductance curves as a function of bias applied on both contacts, as predicted theoretically in the presence of
dynamical Coulomb blockade (DCB) [1]. With bias voltages above the gap applied on both normal-metal electrodes we find surprisingly large
nonlocal conductance signals, almost of the same magnitude as the local conductance. We show that under these conditions heating has a qualitativly
similar effect as DCB on nonlocal conductance, mimicking the effect of Cooper pair splitting [2].
D.S. Golubev and A.D. Zaikin, Phys. Rev. B 82, 134508 (2010)
S. Kolenda et al., Phys. Rev. B 88, 174509 (2013)