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

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 un...

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Bibliographic Details
Published in:Nature communications 2021-02, Vol.12 (1), p.754-754, Article 754
Main Authors: Zhang, Jinzhong, Tse, Pok-Lam, Jalil, Abdur-Rehman, Kölzer, Jonas, Rosenbach, Daniel, Luysberg, Martina, Panaitov, Gregory, Lüth, Hans, Hu, Zhigao, Grützmacher, Detlev, Lu, Jia Grace, Schäpers, Thomas
Format: Article
Language:English
Subjects:
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140/146
147/143
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639/925/927/1007
Accumulation
Coherence length
Conductance
Critical current (superconductivity)
Fluctuations
Humanities and Social Sciences
Josephson junctions
Low temperature
Magnetic fields
Magnetic flux
Magnetic properties
multidisciplinary
Nanotechnology
Nanowires
Oscillations
Resistance
Science
Science (multidisciplinary)
Transport phenomena
Transport properties
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Summary: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  μ A 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. A deep understanding of low-temperature transport properties of GeTe material remains a challenge. Here, the authors investigate phase-coherent phenomena in GeTe nanowire structures where the occurrence of magnetic flux-periodic oscillations come from the formation of a tubular hole accumulation layer.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-021-21042-5