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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.50: Poster
Monday, March 14, 2011, 14:00–18:00, P4
Dynamical Coulomb blockade of nonlocal conductance in N/S hybrid structures — •Michael J. Wolf1, Florian Hübler1,2, Detlef Beckmann1, and Hilbert v. Löhneysen2,3 — 1Institut für Nanotechnologie, KIT, 76021 Karlsruhe, Germany — 2Institut für Festkörperphysik, KIT, 76021 Karlsruhe, Germany — 3Physikalisches Institut, KIT, 76021 Karlsruhe, Germany
In multi-terminal N/S hybrid structures, crossed Andreev reflection and elastic cotunneling give rise to non-zero nonlocal conductance as it was investigated both experimentally and theoretically ([1], [2] and references therein).
We fabricated multi-terminal N/S hybrid structures by standard e-beam lithography and shadow evaporation techniques in order to gain further understanding of the nonlocal signal. The distance between the two contacts was chosen to be approximately 150 nm and care was taken to eliminate Josephson effects. Measurements were taken in a 4-probe setup using lock-in technique.
If non-zero bias voltages VA and VB are applied to both contacts, we observe
a S-shaped nonlocal differential conductance dIB / dVA when sweeping VA.
These findings are consistent with recently published calculations
on the influence of Coulomb effects on the nonlocal conductance in N/S hybrid structures [2].
J. Brauer et al., Phys. Rev. B 81, 024515 (2010)
D.S. Golubev and A.D. Zaikin, Phys. Rev. B 82, 134508
(2010)