Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 55: Graphene and 2D Materials (joint session TT/HL)

HL 55.2: Vortrag

Donnerstag, 20. März 2025, 15:15–15:30, H33

Nonequilibrium Spin Transport in Graphene Proximitized by WSe₂ — •Ming-Hao Liu — Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan

Spin-orbit coupling (SOC) in graphene is known to be negligibly weak, on the order of 0.1 meV, due to its composed atom, carbon, a light element of atomic number only 6. A decade ago, it was found that the SOC in graphene can be significantly enhanced simply by attaching it to a transition metal dichalcogenide of strong SOC, known as the spin-orbit proximity effect. Our recent theoretical work in collaboration with a transport experiment on graphene proximitized by WSe₂ reported a supporting number for the SOC as strong as 12.6 meV [1]. Inspired by this finding, here I present numerical results on nonequilibrium spin Hall accumulation in graphene/WSe₂ heterostructures based on the Landauer-Keldysh formalism [2]. Combined with the recently discussed radial Rashba SOC [3], nonequilibrium spin precession will be shown, paving an alternative way to realize the Datta-Das spin transistor.

[1] Q.Rao et al., Nat. Commun. 14, 6124 (2023);

[2] B.K.Nikolic et al., Phys. Rev. Lett. 95, 046601 (2005);

[3] W.-H.Kang,M.Barth,A.Costa,A.Garcia-Ruiz,A.Mrenca-Kolasinska, M.-H.Liu, D.Kochan, Phys. Rev. Lett. 133, 216201 (2024).

Keywords: quantum transport; spin-orbit coupling