Large spin relaxation anisotropy and valley-Zeeman spin-orbit coupling in WSe2/Gr/hBN heterostructures

Zihlmann, Simon and Garcia, Jose H. and Watanabe, Kenji and Schönenberger, Christian and Makk, Péter and Cummings, Aron W. and Kedves, Máté and Taniguchi, Takashi. (2019) Large spin relaxation anisotropy and valley-Zeeman spin-orbit coupling in WSe2/Gr/hBN heterostructures. Physical review B, 97 (7).

Full text not available from this repository.

Official URL: https://edoc.unibas.ch/68890/

Downloads: Statistics Overview


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
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Zihlmann, Simon and Makk, Peter
Item Type:Article, refereed
Article Subtype:Research Article
e-ISSN: 2469-9969
Note:Publication type according to Uni Basel Research Database: Journal article
Related URLs:
Identification Number:
Last Modified:12 Feb 2020 04:10
Deposited On:04 Apr 2019 15:28

Repository Staff Only: item control page