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HL: Fachverband Halbleiterphysik

HL 74: Poster IIIA

HL 74.11: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/2OG

Control of proximity-induced spin-orbit coupling in graphene/TMDC heterostructures — •Tobias Rockinger, Tobias Völkl, Dieter Weiss, and Jonathan Eroms — Institute of Experimental and Applied Physics, Universität Regensburg, Universitätsstraße 31, 93053 Regensburg

Graphene is known as an ideal candidate for spintronic devices because of its long spin relaxation times. However, for spintronic applications we have to create spin currents as well. Spin currents cannot be created in graphene directly because of graphene's low intrinsic spin-orbit coupling (SOC). Z. Wang et al. [1] showed that one can induce SOC into graphene by proximity-coupling with TMDCs. Because the proximity-induced SOC varies from sample to sample, we strive for a better control over the induced SOC. Theoretical predictions by Y. Li et al. [2] and A. David et al. [3] show that proximity-induced SOC depends on the twist angle between graphene and the TMDC. We therefore fabricated graphene/TMDC heterostructures where the twist angle is controlled during a van der Waals stacking process. To get comparable samples we only use single layer TMDCs on graphene. Four-terminal magnetotransport measurements at low temperatures revealed weak localization and weak anti-localization, showing weak or strong SOC, respectively. The measurements of our first samples agree with theory and show signs of the expected dependence of SOC on the twist angle. [1] Z. Wang et al., Phys. Rev. X 6, 041020 (2016) [2] Y. Li et al., Phys. Rev. B 99, 075438 (2019) [3] A. David et al., Phys. Rev. B 100, 085412 (2019)