Zihlmann, Simon and Cummings, Aron W. and Garcia, Jose H. and Kedves, Máté and Watanabe, Kenji and Taniguchi, Takashi and Schönenberger, Christian and Makk, Péter (2018) Large spin relaxation anisotropy and valley-Zeeman spin-orbit coupling in WSe2 /graphene/ h -BN heterostructures. PHYSICAL REVIEW B, 97 (7). pp. 1-10. ISSN 2469-9950
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Abstract
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 WSe 2 and h -BN is found to exhibit exceptional quality with mobilities as high as 1 × 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.
| Item Type: | Article |
|---|---|
| Subjects: | Q Science / természettudomány > QC Physics / fizika |
| Depositing User: | Dr Peter Makk |
| Date Deposited: | 12 Sep 2018 07:43 |
| Last Modified: | 12 Sep 2018 07:43 |
| URI: | http://real.mtak.hu/id/eprint/83601 |
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- Large spin relaxation anisotropy and valley-Zeeman spin-orbit coupling in WSe2 /graphene/ h -BN heterostructures. (deposited 12 Sep 2018 07:43) [Currently Displayed]
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