Gate Modulation of the Spin-orbit Interaction in Bilayer Graphene Encapsulated by WS2 films

Scientific Reports
Amir Muhammad AfzalJonghwa Eom

Abstract

Graphene has gigantic potential in the development of advanced spintronic devices. The interfacial interactions of graphene with semiconducting transition metal dichalcogenides improve the electronic properties drastically, making it an intriguing candidate for spintronic applications. Here, we fabricated bilayer graphene encapsulated by WS2 layers to exploit the interface-induced spin-orbit interaction (SOI). We designed a dual gated device, where the SOI is tuned by gate voltages. The strength of induced SOI in the bilayer graphene is dramatically elevated, which leads to a strong weak antilocalization (WAL) effect at low temperature. The quantitative analysis of WAL demonstrates that the spin relaxation time is 10 times smaller than in bilayer graphene on conventional substrates. To support these results, we also examined Shubnikov-de Haas (SdH) oscillations, which give unambiguous evidence of the zero-field spin-splitting in our bilayer graphene. The spin-orbit coupling constants estimated by two different measurements (i.e., the WAL effect and SdH oscillations) show close values as a function of gate voltage, supporting the self-consistency of this study's experimental results. The gate modulation of the SOI in bilayer gra...Continue Reading

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Citations

Aug 19, 2020·ACS Applied Materials & Interfaces·Amir Muhammad AfzalJonghwa Eom
Oct 5, 2021·ACS Applied Materials & Interfaces·Amir Muhammad AfzalJonghwa Eom

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Methods Mentioned

BETA
atomic force microscopy

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