Charge-to-spin conversion in twisted graphene/WSe2 heterostructures

Seungjun Lee, D. J.P. De Sousa, Young Kyun Kwon, Fernando De Juan, Zhendong Chi, Fèlix Casanova, Tony Low

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

We investigate the twist-angle dependence of spin-orbit coupling proximity effects and charge-to-spin conversion (CSC) in graphene/WSe2 heterostructures from first principles. The CSC is shown to strongly depend on the twist angle, with standard Rashba-Edelstein and disorder-free spin Hall efficiencies optimized near 30∘ twisting. Symmetry breaking due to twisting also gives rise to an unconventional Rashba-Edelstein effect, with electrically generated nonequilibrium spin densities possessing spins collinear to the applied electric field. Our work provides a perspective on the electrical generation of spins in van der Waals heterostructures.

Original languageEnglish (US)
Article number165420
JournalPhysical Review B
Volume106
Issue number16
DOIs
StatePublished - Oct 15 2022

Bibliographical note

Funding Information:
S.L. is primarily supported by Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2021R1A6A3A14038837). S.L. and T.L. are partially supported by NSF DMREF-1921629. D.S. and T.L. are partially supported by the Valleytronics Intel Science Technology Center, and SMART, one of the seven centers of nCORE, a Semiconductor Research Corporation program, sponsored by National Institute of Standards and Technology (NIST). Y.-K.K. acknowledges financial support from the Korean government through the National Research Foundation of Korea (NRF-2022M3F3A2A01073562). Z.C. and F.C. acknowledge funding by the Valleytronics Intel Science Technology Center, by the Spanish MICINN (Project No. RTI2018-094861-B-I00 and Maria de Maeztu Units of Excellence Programme No. CEX2020-001038-M) and by Diputación de Gipuzkoa (Project No. 2021-CIEN-000037-01). F.J. acknowledges funding by the Spanish MCI/AEI/FEDER (Project No. PGC2018-101988-B-C21) and by Diputacion de Gipuzkoa (Project No. 2021-100-000070-01). We acknowledge the MSI in the University of Minnesota for providing the computational resources and useful discussions with Raseong Kim and Ian Young from Intel Corporation. We thank Aires Ferreira and David T. S. Perkins for fruitful discussions on the vertex correction.

Publisher Copyright:
© 2022 American Physical Society.

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