In-plane magnetic field induced orbital Fulde-Ferrell-Larkin-Ovchinnikov superconductivity in twisted WSe2 homobilayers

Jihang Zhu; Yang-Zhi Chou; Yi Huang; Sankar Das Sarma

doi:10.1103/bqns-1ld3

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In-plane magnetic field induced orbital Fulde-Ferrell-Larkin-Ovchinnikov superconductivity in twisted WSe2 homobilayers

Jihang Zhu, Yang-Zhi Chou, Yi Huang, Sankar Das Sarma

DOI 10.1103/bqns-1ld3 · Physical Review B

T1

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Abstract

We theoretically predict in-plane magnetic field induced orbital Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting states in twisted WSe2 homobilayers (tWSe2), focusing on their dependence on layer polarization and Fermi surface geometry. For unpolarized layers, finite-momentum pairing emerges only at low temperatures and above a critical field Bc1,∥. When layer symmetry is broken, finite-momentum pairing is stabilized at any nonzero field, with a critical temperature higher than that of the zero-momentum state. Notably, we identify a phase transition, which separates two distinct FFLO phases, when there are two separate Fermi pockets residing in the two moiré minivalleys associated with opposite layers. We further discuss the effects of twist angles and applied field directions. Our findings establish tWSe2 as a promising platform for realizing and manipulating FFLO states via twist angles, displacement fields, and filling factors.

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.	—	Pressure not reported	unknown