期刊
PHYSICAL REVIEW B
卷 97, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.075434
关键词
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资金
- European Union [696656]
- Swiss National Science Foundation
- Swiss Nanoscience Institute
- Swiss NCCR QSIT
- ISpinText FlagERA network
- OTKA [PD-121052, FK-123894, K112918]
- Bolyai Fellowship
- Severo Ochoa program from Spanish MINECO [SEV-2013-0295]
- CERCA Programme/Generalitat de Catalunya
- Elemental Strategy Initiative by the MEXT, Japan
- JSPS KAKENHI Grant [JP15K21722]
Large spin-orbital proximity effects have been predicted in graphene interfaced with a transition-metal dichalcogenide layer. Whereas clear evidence for an enhanced spin-orbit coupling has been found at large carrier densities, the type of spin-orbit coupling and its relaxation mechanism remained unknown. We show an increased spin-orbit coupling close to the charge neutrality point in graphene, where topological states are expected to appear. Single-layer graphene encapsulated between the transition-metal dichalcogenide WSe2 and h-BN is found to exhibit exceptional quality with mobilities as high as 1 x 10(5) cm(2) V-1 s(-1). At the same time clear weak antilocalization indicates strong spin-orbit coupling, and a large spin relaxation anisotropy due to the presence of a dominating symmetric spin-orbit coupling is found. Doping-dependent measurements show that the spin relaxation of the in-plane spins is largely dominated by a valley-Zeeman spin-orbit coupling and that the intrinsic spin-orbit coupling plays a minor role in spin relaxation. The strong spin-valley coupling opens new possibilities in exploring spin and valley degree of freedom in graphene with the realization of new concepts in spin manipulation.
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