Flux periodic oscillations and phase-coherent transport in GeTe nanowire-based devices

Jinzhong Zhang, Pok-Lam Tse, Abdur-Rehman Jalil, Jonas Kölzer, Daniel Rosenbach, Martina Luysberg, Gregory Panaitov, Hans Lüth, Zhigao Hu, Detlev Grützmacher, Jia Grace Lu and Thomas Schäpers ()
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Jinzhong Zhang: Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich
Pok-Lam Tse: University of Southern California
Abdur-Rehman Jalil: Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich
Jonas Kölzer: Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich
Daniel Rosenbach: Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich
Martina Luysberg: Ernst Ruska Center, Forschungszentrum Jülich
Gregory Panaitov: Institute of Complex Systems (ICS-8) Forschungszentrum Jülich
Hans Lüth: Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich
Zhigao Hu: East China Normal University
Detlev Grützmacher: Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich
Jia Grace Lu: University of Southern California
Thomas Schäpers: Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Despite the fact that GeTe is known to be a very interesting material for applications in thermoelectrics and for phase-change memories, the knowledge on its low-temperature transport properties is only limited. We report on phase-coherent phenomena in the magnetotransport of GeTe nanowires. From universal conductance fluctuations measured on GeTe nanowires with Au contacts, a phase-coherence length of about 280 nm at 0.5 K is determined. The distinct phase-coherence is confirmed by the observation of Aharonov–Bohm type oscillations for parallel magnetic fields. We interpret the occurrence of these magnetic flux-periodic oscillations by the formation of a tubular hole accumulation layer. For Nb/GeTe-nanowire/Nb Josephson junctions we obtained a critical current of 0.2 μA at 0.4 K. By applying a perpendicular magnetic field the critical current decreases monotonously with increasing field, whereas in a parallel field the critical current oscillates with a period of the magnetic flux quantum confirming the presence of a tubular hole channel.

Date: 2021
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DOI: 10.1038/s41467-021-21042-5

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