标题： 拓扑超导体/铁磁绝缘体薄膜异质结构中的混合磁子-纳姆布-戈德斯通激发 显示英文标题

标题： Hybrid magnon -- Nambu-Goldstone excitations in topological superconductor/ferromagnetic insulator thin-film heterostructures

摘要： 我们研究了一种之前未被探索的动态邻近效应，这种效应发生在s波拓扑超导体/铁磁绝缘体（TS/FI）异质结构中。 预测在FI中的磁振子和TS中的Nambu-Goldstone（NG）集体超导相模式之间会发生耦合，形成复合磁振子-NG激发态。 这种耦合的机制与TS螺旋表面态中电子的完全自旋-动量锁定有关。 磁振子-NG耦合的强度相对于磁振子波矢和FI平衡磁化方向的相互取向表现出强烈的各向异性。 这种效应提供了一种将自旋信号与由集体超导激发携带的无自旋信号相互转换的机制，从而为超导自旋电子学的发展提供了新的动力。 显示英文摘要

摘要： We address a previously unexplored type of dynamical proximity effect that occurs in s-wave topological superconductor/ferromagnetic insulator (TS/FI) heterostructures. It is predicted that magnons in the FI and the Nambu-Goldstone (NG) collective superconducting phase mode in the TS are coupled, forming composite magnon-NG excitations. The mechanism of this coupling is associated with the complete spin-momentum locking of electrons in the helical surface state of the TS. The strength of the magnon-NG coupling is strongly anisotropic with respect to the mutual orientation of the magnon wave vector and the equilibrium magnetization of the FI. This effect provides a mechanism for the interconversion of spin signals and the spinless signals carried by collective superconducting excitations, thereby giving new impetus to the development of superconducting spintronics.