Phase coherent transport and spin-orbit interaction in GaAs/InSb core/shell nanowires

被引：5
|
作者：
Zellekens P. [1 ,5 ,6 ]
Demarina N. [2 ,5 ]
Janßen J. [1 ,5 ,6 ]
Rieger T. [1 ,5 ]
Ion Lepsa M. [3 ,5 ]
Perla P. [1 ,5 ,6 ]
Panaitov G. [4 ,5 ]
Lüth H. [1 ,5 ]
Grützmacher D. [1 ,5 ]
Schapers T. [1 ,5 ]
机构：
[1] Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Jülich
[2] Peter Grünberg Institute (PGI-2), Forschungszentrum Jülich, Jülich
[3] Peter Grünberg Institute (PGI-10), Forschungszentrum Jülich, Jülich
[4] Institute of Complex Systems (ICS-8), Forschungszentrum Jülich, Jülich
[5] JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Jülich
[6] Experimental Physics IV F, RWTH Aachen University, Aachen
来源：
Semiconductor Science and Technology | 2020年 / 35卷 / 08期
关键词：
III-V semiconductors; magnetotransport measurements; Nanowires; phase coherent transport; spin-orbit interaction; universal conductance fluctuations;
D O I：
10.1088/1361-6641/ab8396
中图分类号：
学科分类号：
摘要：
Lowerature magnetotransport measurements are performed on GaAs/InSb core-shell nanowires. The nanowires were self-catalyzed grown by molecular beam epitaxy. The conductance measurements as a function of back-gate voltage show an ambipolar behavior comprising an insulating range in between the transition from the p-type to the n-type region. Simulations based on a self-consistent Schrödinger-Poisson solver revealed that the ambipolar characteristics originate from a Fermi level dependent occupation of hole and electron states within the approximately circular quantum well formed in the InSb shell. By applying a perpendicular magnetic field with respect to the nanowire axis, conductance fluctuations were observed, which are used to extract the phase-coherence length. By averaging the magneto-conductance traces at different back-gate voltages, weak antilocalization features are resolved. Regular flux-periodic conductance oscillations are measured when an axial magnetic field is applied. These oscillations are attributed to closed-loop quantized states located in the InSb shell which shift their energetic position periodically with the magnetic flux. Possible reasons for experimentally observed variations in the oscillation patterns are discussed using simulation results. © 2020 The Author(s). Published by IOP Publishing Ltd.
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