发表机构
Institute of Physics; Homi Bhabha National Institute（印度物理研究所; 霍米·巴巴国立研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出理论框架，通过量子自旋霍尔绝缘体与非常规p波磁铁的二维异质结构，调控一阶和二阶拓扑超导相的转变，解析其拓扑性质及配对竞争机制。
AI 中文摘要
本文提出了一个理论框架，用于在由量子自旋霍尔绝缘体（QSHI）和非常规p波磁铁组成的二维（2D）异质结构中构建一阶和二阶拓扑超导相，该异质结构存在邻近诱导的s波超导配对。分析表明，平庸相与拓扑超导（TSC）相之间的转变可通过p波磁铁的参数调控。手征对称性的存在使得两种TSC相可分别用一维绕数和四极绕数表征。这些结果辅以解析有效低能边缘理论，该理论能更深入地理解系统不同拓扑相的出现。体配对分析揭示了有效(pₓ+pᵧ)型与(pₓ+ipᵧ)型配对之间的竞争，二者分别由QSHI的固有自旋轨道耦合和p波磁铁的自旋分裂能带调控。
英文摘要
A theoretical framework is proposed to engineer both first and second-order topological superconducting phases in a two-dimensional (2D) heterostructure, consisting of a quantum spin Hall insulator (QSHI) and an unconventional $p$-wave magnet in presence of proximity-induced $s$-wave superconducting pairing. Our analysis establishes that the transitions between the trivial and topological superconducting (TSC) phases can be regulated though the parameters of $p$-wave magnet. Presence of chiral symmetry leads to the characterization of both types of TSC phases by the respective invariants, one-dimensional winding number and quadrupolar winding number. These results are supplemented by an analytical effective low-energy edge theory that yields a deeper insight into the emergence of the different topological phases of the system. Bulk pairing analysis reveals the competition between the effective $(p_x+p_y)$ and $(p_x+ip_y)$ type pairings that are governed by the intrinsic spin-orbit coupling inherited to the QSHI and spin-split bands of the $p$-wave magnet, respectively.
Comments6 Pages + 5 PDF Figures (Main Text) and 6 Pages (Supplementary Material); Comments are welcome
