期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.177701
关键词
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资金
- European Union's Horizon 2020 research and innovation programme [785219]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence StrategyCluster of Excellence Matter and Light for Quantum Computing (ML4Q) through DFG [EXC 2004/1-390534769, BE 2441/9-1, STA 1146/11-1]
- Austrian WWTF Project [MA14-002]
- Helmholtz Nano Facility
- Elemental Strategy Initiative by the MEXT, Japan
- CREST, JST [JPMJCR15F3]
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 mu eV 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 6e(2)/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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