Journal Article

FZJ-2020-01575

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Phase coherent transport and spin-orbit interaction in GaAs/InSb core/shell nanowires

Zellekens, P.FZJ* ; Demarina, N.FZJ* ; Janssen, J.FZJ* ; Rieger, T. ; Lepsa, M. I.FZJ* ; Perla, P.FZJ* ; Panaitov, G.FZJ* ; Lüth, H.FZJ* ; Grützmacher, D.FZJ* ; Schäpers, T. (Corresponding author)FZJ*

2020
IOP Publ. Bristol

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Please use a persistent id in citations: http://hdl.handle.net/2128/25138  doi:10.1088/1361-6641/ab8396  doi:10.1088/1361-6641/ab839

Abstract: Low-temperature 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.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. Theoretische Nanoelektronik (PGI-2)
3. JARA Institut Green IT (PGI-10)
4. Bioelektronik (IBI-3)
5. JARA-FIT (JARA-FIT)

Research Program(s):

1. 522 - Controlling Spin-Based Phenomena (POF3-522) (POF3-522)

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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