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In-plane magnetic field-induced orbital FFLO superconductivity in twisted WSe$_2$ homobilayers
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abstract
We theoretically predict the in-plane magnetic field-induced orbital Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting states in twisted WSe$_2$ homobilayers (tWSe$_2$), focusing on its 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 moir\'e mini-valleys associated with opposite layers. We further discuss the effects of twist angles and applied field directions. Our findings establish tWSe$_2$ as a promising platform for realizing and manipulating FFLO states via twist angle, displacement field, and filling factor.
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Cited by 1 Pith paper
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Layer Pseudospin Superconductivity in Twisted MoTe$_2$
In twisted MoTe2, layer pseudospin makes interlayer pairing dominant for spin-valley-polarized superconductivity and lets displacement fields plus in-plane magnetic fields stabilize and select finite-momentum pairing states.
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