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Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Focus Session (with TT): Functional semiconductor nanowires II

HL 13.9: Talk

Monday, March 16, 2015, 17:45–18:00, EW 201

Giant Magnetoconductance Oscillations in Hybrid Superconductor - Semiconductor Core/Shell Nanowire Devices — •Fabian Haas1,2, Önder Gül1,2, Haci Yusuf Günel1,2, Hans Lüth1,2, Torsten Rieger1,2, Tobias Wenz1,2, Patrick Zellekens1,2, Mihail Lepsa1,2, Gregory Panaitov1,2, Detlev Grützmacher1,2, and Thomas Schäpers1,21Peter Grünberg Institute (PGI-9 and PGI-8), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — 2JARA - Fundamentals of Future Information Technology

In GaAs/InAs core/shell nanowires the electrons are confined in the cylindrical conductive InAs shell. In recent publications we have shown that this InAs nanotube allows the observation of h/e flux periodic oscillations in the nanowires magnetoconductance, when a magnetic field is aligned in parallel with the nanowire axis.

In this contribution, we present novel magnetotransport measurements of GaAs/InAs core/shell nanowires, this time contacted with two superconducting Nb electrodes. We observe regular h/2e half-flux periodic oscillations with amplitudes in the order of e2/h, which is larger by two orders of magnitude than observed for the h/e oscillations in a reference sample contacted with Ti/Au leads.

Phase-coherent resonant Andreev reflections at the Nb-nanowire interface, where interfering electron-hole trajectories enclose the penetrating magnetic flux, can explain these strongly enhanced oscillations as well as the h/2e flux periodicity.

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