报告题目 (Title)：二维超导-磁性异质结中构筑FFLO态的研究
报告人 (Speaker)：李军 研究员（上海科技大学物质科学与技术学院）
报告时间 (Time)：2024年12月23日（周一）15:00-16:30
报告地点 (Place)：校本部G601
邀请人(Inviter)：钟建新
主办部门：量子科技研究院/古天乐代言太阳集团物理系
报告摘要：The monolayer or few-layer NbSe2 is recently considered as an Ising-type superconductivity with momentum-spin locking along out-of-plane, which induces dramatic enhancement of upper critical field as a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. Such momentum-spin locking effect can be also found in the Rashba-type superconductivity, while the spins are pinned within the in-plane. However, whether the Ising-type and Rashba-type superconductivity can coexistent in the same system is still an open question. Here, we design a van der Waals heterostructures of few-layer NbSe2 and ferromagnetic insulator CrSiTe3 to explore the coexistence of Ising- and Rashba-type pairs. Nonreciprocal supercurrent has been observed under magnetic fields along both out-of-plane and in-plane directions, indicating the broken inversion symmetry in different directions. The temperature-dependent in-plane critical field reveals an FFLO state at low-temperature regions. The observation of in-plane and out-of-plane nonreciprocal supercurrent coinciding with the FFLO state implies the coexistence of Ising- and Rashba-type superconductivity. The inducement of heterostructure provides an exotic path for designing strongly anisotropic superconductivity diode effect for superconducting spintronics.
