Increasing the proximity-induced spin-orbit coupling in bilayer graphene / WSe 2 heterostructures with pressure

Szentpéteri, Bálint and Márffy, Albin Máté and Kedves, Máté and Tóvári, Endre and Fülöp, Bálint and Kükemezey, István and Magyarkuti, András and Watanabe, Kenji and Taniguchi, Takashi and Csonka, Szabolcs and Makk, Péter (2025) Increasing the proximity-induced spin-orbit coupling in bilayer graphene / WSe 2 heterostructures with pressure. PHYSICAL REVIEW B, 111 (20). No. 205415. ISSN 2469-9950

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Abstract

Combining graphene with transition metal dichalcogenides (TMDs) leads to enhanced spin-orbit coupling (SOC) in graphene. The induced SOC has a large effect on the low-energy part of the band structure, leading to or stabilizing topological phases or superconductivity. Here, the pressure dependence of the SOC strength is investigated in bilayer graphene/WSe2 heterostructures. We performed magnetoconductance studies, such as weak localization, quantum Hall, and Shubnikov–de Haas oscillation measurements, to extract the different SOC terms which determine the low-energy band structure of bilayer graphene. We find the proximity-induced SOC strengths increased by more than 50% as a result of applying 2 GPa hydrostatic pressure. Our studies highlight the opportunity to increase the SOC coupling strength with pressure, which can be important for correlated phases or spin qubits in bilayer graphene/WSe2 heterostructures.

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