Journal Article

FZJ-2023-03395

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Aharonov-Bohm Interference and Phase-Coherent Surface-State Transport in Topological Insulator Rings

Behner, G. (Corresponding author)FZJ* ; Jalil, A. R.FZJ* ; Heffels, D.FZJ* ; Kölzer, J.FZJ* ; Moors, K.FZJ* ; Mertens, J.FZJ* ; Zimmermann, E.FZJ* ; Mussler, G. ; Schüffelgen, P.FZJ* ; Lüth, H.FZJ* ; Grützmacher, D.FZJ* ; Schäpers, T.FZJ*

2023
ACS Publ. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.nanolett.3c00905  doi:10.34734/FZJ-2023-03395

Abstract: We present low-temperature magnetotransport measurements on selectively grown Sb2Te3-based topological insulator ring structures. These devices display clear Aharonov-Bohm oscillations in the conductance originating from phase-coherent transport around the ring. The temperature dependence of the oscillation amplitude indicates that the Aharonov-Bohm oscillations originate from ballistic transport along the ring arms. We attribute these oscillations to the topological surface states. Further insight into the phase coherence is gained by comparing with similar Aharonov-Bohm-type oscillations in topological insulator nanoribbons exposed to an axial magnetic field. Here, quasi-ballistic phase-coherent transport is confirmed for closed-loop topological surface states in the transverse direction enclosing the nanoribbon. In contrast, the appearance of universal conductance fluctuations indicates phase-coherent transport in the diffusive regime, which is attributed to bulk carrier transport. Thus, it appears that even in the presence of diffusive p-type charge carriers in Aharonov-Bohm ring structures, phase-coherent quasi-ballistic transport of topological surface states is maintained over long distances.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)

Research Program(s):

1. 5222 - Exploratory Qubits (POF4-522) (POF4-522)

Appears in the scientific report 2023

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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