Superconductivity in twisted transition metal dichalcogenide homobilayers

Jihang Zhu; Yang-Zhi Chou; Ming Xie; Sankar Das Sarma

doi:10.1103/PhysRevB.111.L060501

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Superconductivity in twisted transition metal dichalcogenide homobilayers

Jihang Zhu, Yang-Zhi Chou, Ming Xie, Sankar Das Sarma

DOI 10.1103/PhysRevB.111.L060501 · Physical Review B

T1

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Abstract

Recently, robust superconductivity has been independently reported in twisted WSe2 bilayers by two separate groups [Y. Xia et al., arXiv:2405.14784; Y. Guo et al., Nature (London) 637, 839 (2025)]. In light of this, we explore the possibility of a universal superconducting pairing mechanism in twisted WSe2 bilayers. Using a continuum band structure and a phenomenological boson-mediated effective electron-electron attraction, we find that intervalley intralayer pairing predominates over interlayer pairing. Notably, despite very different experimental conditions, both twisted WSe2 samples exhibit a comparable effective attraction strength for superconductivity. This consistency in the two experiments suggests that the dominant pairing glue is likely independent of the twist angle and layer polarization, pointing to a universal underlying boson-induced pairing mechanism. We speculate on the possible mechanisms in the discussion.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
WSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.22	Pressure not reported	unknown
WSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.426	Pressure not reported	unknown