Unraveling the Spin-to-Charge Current Conversion Mechanism and Charge Transfer Dynamics at Interface of Graphene/WS${}_2$ Heterostructures at Room Temperature

Abstract

We report experimental investigations of spin-to-charge current conversion and charge transfer dynamics (CT) at the interface of graphene/WS${}_2$ van der Waals heterostructure. Pure spin current was produced by the spin precession in the microwave-driven ferromagnetic resonance of a permalloy film (Py-Ni${}_{81}$Fe${}_{19}$) and injected into the graphene/WS${}_2$ heterostructure through the spin pumping process. The observed spin-to-charge current conversion in the heterostructure is attributed to inverse Rashba-Edelstein effect (IREE) at the graphene/WS${}_2$ interface. Interfacial CT dynamics in this heterostructure was investigated based on the framework of core-hole-clock (CHC) approach. The results obtained from spin pumping and CHC studies show that the spin-to-charge current conversion and charge transfer process are more efficient in the graphene/WS${}_2$ heterostructure compared to isolated WS2 and graphene films. The results show that the presence of WS${}_2$ flakes improves the current conversion efficiency. These experimental results are corroborated by density functional theory (DFT) calculations, which reveal (i) Rashba spin-orbit splitting of graphene orbitals and (ii) electronic coupling between graphene and WS${}_2$ orbitals. This study provides valuable insights for optimizing the design and performance of spintronic devices.

25 pages, 7 figures

References in corpus (7)

• Emergent Phenomena Induced by Spin-Orbit Coupling at Surfaces and Interfaces
• Chloride Molecular Doping Technique on 2D Materials: WS2 and MoS2
• Orbitronics: Orbital Currents in Solids
• Observation of inverse spin Hall effect in bismuth selenide
• An experimental demonstration of room-temperature spin transport in n-type Germanium epilayers
• Dirac-Surface-State-Dominated Spin to Charge Current Conversion in the Topological Insulator $(B{i}_{0.22}S{b}_{0.78}{)}_{2}T{e}_3$ Films at Room Temperature
• Dynamical spin injection at a quasi-one-dimensional ferromagnet-graphene interface

Cited by in corpus (2)

• Probing the Spin-Momentum Locking in Rashba Surfaces via Spin Current
• Spin Pumping into two-dimensional systems