发表机构
Purdue University; University of Minnesota Twin Cities（普渡大学; 明尼苏达大学双城分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出基于超电流响应的体探针方法，研究一维Rashba自旋轨道耦合超导纳米线，发现拓扑相内超电流被抑制2倍，可通过动能电感测量探测体拓扑相转变。
AI 中文摘要
区分平庸超导相与拓扑超导相仍是核心且存在争议的实验挑战，因为多数现有探针通过边界特征间接推断体相转变，而边界特征可能对局域物理敏感。本文提出一种基于超电流响应的替代方案，可探测体拓扑相。我们研究了施加磁场以打开拓扑能隙的一维Rashba自旋轨道耦合超导纳米线，结果表明，在强自旋轨道耦合下，超流刚度及超电流在拓扑相内被抑制了2倍，随化学势变化呈现体相转变的非单调特征。我们进一步采用低能螺旋模型对该抑制进行解析理解，研究显示可通过动能电感测量探测体拓扑相转变。
英文摘要
Distinguishing trivial from topological superconducting phase remains a central and contested experimental challenge, since most existing probes infer the bulk phase transition indirectly, from boundary signatures that can be sensitive to local physics. Here, we propose an alternative that probes the bulk topological phase and is based on supercurrent response. We study a one-dimensional Rashba spin-orbit-coupled superconducting nanowire with an applied magnetic field that opens a topological gap. We show that for strong spin-orbit coupling, the superfluid stiffness, and consequently the supercurrent, is suppressed by a factor of two inside the topological phase, producing a non-monotonic signature of the bulk phase transition as a function of chemical potential. We further use a low-energy helical model to understand this suppression analytically. Our results show that the bulk topological phase transition can be detected through kinetic inductance measurements.
