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DS: Fachverband Dünne Schichten

DS 5: 2D Materials and their Heterostructures II: Graphene and Graphene Containing Heterostructures

DS 5.8: Vortrag

Dienstag, 19. März 2024, 11:30–11:45, A 053

Proximity enhancement of Rashba angle in graphene/1T-TaS₂ heterostructures — •Martin Gmitra^1,2, Marko Milivojević^3,4, and Karol Szałowski⁵ — ¹Institute of Physics, Pavol Jozef Šafárik University in Košice, 04001 Košice, Slovakia — ²Institute of Experimental Physics, Slovak Academy of Sciences, 04001 Košice, Slovakia — ³Institute of Informatics, Slovak Academy of Sciences, 84507 Bratislava, Slovakia — ⁴Faculty of Physics, University of Belgrade, 11001 Belgrade, Serbia — ⁵University of Łódź, Faculty of Physics and Applied Informatics, Department of Solid State Physics, 90-236 Łódź, Poland

Van der Waals heterostructures provide unprecedented control of Dirac electronic states in graphene via proximity effects. In the talk, we present an electronic structure study of graphene/1T-TaS₂ heterostructure and show that the charge density wave phase in 1T-TaS₂ monolayer enhances significantly the Rashba angle in proximitized graphene. The Rashba spin-orbit coupling parameters can be further enhanced by applying a transverse electric field. We found also that the particular sandwich structures 1T-TaS₂/graphene/1T-TaS₂ trigger the Rashba angle to the π/2 limit relevant for specific charge-to-spin conversion utilizing collinear Rashba-Edelstein effect.

This work was supported by the APVV SK-CZ-RD-21-0114, FLAG ERA JTC 2021 2DSOTECH, IMPULZ IM-2021-42, and SASPRO 2 No. 945478 research grants.

Keywords: graphene; proximity effects; first-principles study; tight-binding model