TY  - JOUR
AU  - Banszerus, L.
AU  - Frohn, B.
AU  - Fabian, T.
AU  - Somanchi, S.
AU  - Epping, A.
AU  - Müller, M.
AU  - Neumaier, D.
AU  - Watanabe, K.
AU  - Taniguchi, T.
AU  - Libisch, F.
AU  - Beschoten, B.
AU  - Hassler, F.
AU  - Stampfer, C.
TI  - Observation of the Spin-Orbit Gap in Bilayer Graphene by One-Dimensional Ballistic Transport
JO  - Physical review letters
VL  - 124
IS  - 17
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2020-02147
SP  - 177701
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:32412294
UR  - <Go to ISI:>//WOS:000529840700007
DO  - DOI:10.1103/PhysRevLett.124.177701
UR  - https://juser.fz-juelich.de/record/877334
ER  -