%0 Journal Article
%A Banszerus, L.
%A Frohn, B.
%A Fabian, T.
%A Somanchi, S.
%A Epping, A.
%A Müller, M.
%A Neumaier, D.
%A Watanabe, K.
%A Taniguchi, T.
%A Libisch, F.
%A Beschoten, B.
%A Hassler, F.
%A Stampfer, C.
%T Observation of the Spin-Orbit Gap in Bilayer Graphene by One-Dimensional Ballistic Transport
%J Physical review letters
%V 124
%N 17
%@ 1079-7114
%C College Park, Md.
%I APS
%M FZJ-2020-02147
%P 177701
%D 2020
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:32412294
%U <Go to ISI:>//WOS:000529840700007
%R 10.1103/PhysRevLett.124.177701
%U https://juser.fz-juelich.de/record/877334