Speaker
Description
Recent advances in two-dimensional materials have opened new avenues for exploring unconventional superconductivity in engineered multilayers. Among them, transition metal dichalcogenides (TMDs), such as NbSe2, offer a unique platform to investigate Ising superconductivity and quantum phase transitions under strong spin-orbit coupling. In this talk, I will show Fulde-Ferrell-Larkin-Ovchinnikov FFLO state arises from Josephson coupling between adjacent superconducting layers, enabling the formation of finite-momentum pairing states. I will present evidence for identifying orbital Fulde–Ferrell (FF) and Larkin–Ovchinnikov (LO) states in multilayer NbSe2, where field-tunable inversion symmetry breaking emerges spontaneously within a globally centrosymmetric system. These FF/LO phases exhibit distinctive features such as nonreciprocal transport, Berezinskii–Kosterlitz–Thouless (BKT) criticality near phase boundaries, and strongly anisotropic I–V characteristics. Our findings reveal that inversion symmetry breaking can be a dynamic and emergent property of finite-momentum condensates, offering a new pathway to polar superconductivity and exotic collective behavior in 2D quantum systems.
