2025/06/15 by Jin-Xin Hu, Akito Daido, Hu, Jin-Xin +7 · 2 citations
Materials Science · Chemistry · #2D Materials and Applications #Organic and Molecular Conductors Research #Inorganic Chemistry and Materials
paper · pdf · doi:10.48550/arxiv.2506.12767
Recent experiments have observed signatures of spin-valley-polarized unconventional superconductivity in twisted bilayer MoTe2 (tMoTe2). Here, we explore the rich physics of superconducting tMoTe2, enabled by its unique layer-pseudospin structure. Within a minimal two-orbital layer-pseudospin model framework, both interlayer and intralayer Cooper pairings can be effectively visualized using a layer-space Bloch sphere representation. Remarkably, we find that interlayer pairing prevails in the spin-valley-polarized state, whereas intralayer pairing dominates in the spin-valley-unpolarized state. Strikingly, we further predict that for spin-valley-polarized intravalley superconducting state, experimentally feasible weak displacement fields can stabilize finite-momentum pairings at low temperatures. Additionally, in-plane magnetic fields, which break three-fold rotational symmetry, induce field-direction-dependent finite-momentum pairing states, leading to a versatile momentum-selection phase diagram. Our work highlights the crucial role of layer pseudospin in tMoTe2's unconventional superconductivity and demonstrates its unique tunability via external fields.