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Enhanced superconductivity through virtual tunneling in Bernal bilayer graphene coupled to WSe₂

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arxiv 2206.09922 v3 pith:CLEFDP2J submitted 2022-06-20 cond-mat.supr-con cond-mat.mes-hallcond-mat.mtrl-sci

Enhanced superconductivity through virtual tunneling in Bernal bilayer graphene coupled to WSe₂

classification cond-mat.supr-con cond-mat.mes-hallcond-mat.mtrl-sci
keywords bernalbilayergraphenesuperconductivitycouplingisingspin-orbittunneling
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Motivated by a recent experiment [arXiv:2205.05087], we investigate a possible mechanism that enhances superconductivity in hole-doped Bernal bilayer graphene due to a proximate WSe$_2$ monolayer. We show that the virtual tunneling between WSe$_2$ and Bernal bilayer graphene, which is known to induce Ising spin-orbit coupling, can generate an additional attraction between two holes, providing a potential explanation for enhancing superconductivity in Bernal bilayer graphene. Using microscopic interlayer tunneling, we derive the Ising spin-orbit coupling and the effective attraction as functions of the twist angle between Bernal bilayer graphene and the WSe$_2$ monolayer. Our theory provides an intuitive and physical explanation for the intertwined relation between Ising spin-orbit coupling and superconductivity enhancement, which should motivate future studies.

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