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TT: Fachverband Tiefe Temperaturen
TT 41: Quantum Transport and Quantum Hall Effects II (joint session HL/TT)
TT 41.1: Vortrag
Mittwoch, 29. März 2023, 15:00–15:15, JAN 0027
Aharonov-Bohm-type oscillations in phase-pure core/shell GaAs/InAs nanowires — •Farah Basaric1,2, Anton Faustmann1,2, Erik Zimmermann1,2, Gerrit Behner1,2, Alexander Pawlis1,2, Christoph Krause1,2, Hans Lüth1,2, Detlev Grützmacher1,2, and Thomas Schäpers1,2 — 1Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, Germany
Epitaxially grown phase-pure GaAs/InAs core/shell nanowires offer uniformity in their electrical, mechanical and optical properties due to the absence of a crystallographic disorder. Magnetotransport measurements were carried out at variable temperatures and for different gate voltages, under an applied in-plane magnetic field. Pronounced Aharonov-Bohm-type oscillations in the conductance are observed for this nanowire type. In measurements at different gate voltages, significantly higher oscillation amplitudes are observed in comparison to the corresponding measurements on polymorphic core/shell nanowires. Furthermore, measurements at different temperatures show robustness of these oscillations against high temperatures as a result of reduced disorder. Finally, strong indications of a quasi-ballistic transport regime could be recognized for the phase-pure nanowire type. Obtained results indicate a strong effect of disorder reduction in GaAs/InAs nanowire transport properties, manifested in superior transport properties.