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arXiv · 2009.06995

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·Thomas Schäpers
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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. Here, we report on phase-coherent phenomena in the magnetotransport of GeTe nanowires. From universal conductance fluctuations, a phase-coherence length of about 200nm at 0.5K is determined for the hole carriers. The distinct phase-coherence is confirmed by the observation of Aharonov--Bohm type oscillations for magnetic fields applied along the nanowire axis. We interpret the occurrence of these magnetic flux-periodic oscillations by the formation of a tubular hole accumulation layer on the nanowire surface. In addition, for Nb/GeTe-nanowire/Nb Josephson junctions, we obtained a proximity-induced critical current of about 0.2$\mu$A at 0.4K. By applying a magnetic field perpendicular to the nanowire axis, the critical current decreases monotonously with increasing magnetic field, which indicates that the structure is in the small-junction-limit. Whereas, by applying a parallel magnetic field the critical current oscillates with a period of the magnetic flux quantum indicating once again the presence of a tubular hole channel.

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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, Thomas Schäpers. 2020-09-15. Flux periodic oscillations and phase-coherent transport in GeTe nanowire-based devices. https://doi.org/10.1038/s41467-021-21042-5

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