We theoretically predict in-plane magnetic field induced orbital Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting states in twisted ${\mathrm{WSe}}_2$ homobilayers (${\mathrm{tWSe}}_2$), 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 $B_{c1,\parallel }$. 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 ${\mathrm{tWSe}}_2$ as a promising platform for realizing and manipulating FFLO states via twist angles, displacement fields, and filling factors.

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• FFLO
• Phase diagrams
• Superconducting phase transition
• Superconductivity
• Transition metal dichalcogenides
• Bogoliubov-de Gennes equations