Journal Article

FZJ-2020-02147

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Observation of the Spin-Orbit Gap in Bilayer Graphene by One-Dimensional Ballistic Transport

Banszerus, L.RWTH* ; Frohn, B.RWTH* ; Fabian, T. ; Somanchi, S.RWTH* ; Epping, A.RWTH* ; Müller, M.RWTH* ; Neumaier, D.RWTH* ; Watanabe, K. ; Taniguchi, T. ; Libisch, F. ; Beschoten, B.RWTH* ; Hassler, F.RWTH* ; Stampfer, C. (Corresponding author)FZJ*

2020
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/24934  doi:10.1103/PhysRevLett.124.177701

Abstract: We report on measurements of quantized conductance in gate-defined quantum point contacts in bilayer graphene that allow the observation of subband splittings due to spin-orbit coupling. The size of this splitting can be tuned from 40 to 80  μeV by the displacement field. We assign this gate-tunable subband splitting to a gap induced by spin-orbit coupling of Kane-Mele type, enhanced by proximity effects due to the substrate. We show that this spin-orbit coupling gives rise to a complex pattern in low perpendicular magnetic fields, increasing the Zeeman splitting in one valley and suppressing it in the other one. In addition, we observe a spin polarized channel of 6e2/h at high in-plane magnetic field and signatures of interaction effects at the crossings of spin-split subbands of opposite spins at finite magnetic field.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. 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 - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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