发表机构
Universidad Autónoma de Madrid; Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid; Instituto de Estructura de la Materia IEM-CSIC; Instituto Nicolás Cabrera, Universidad Autónoma de Madrid（马德里自治大学; 马德里自治大学凝聚态物理中心（IFIMAC）; CSIC物质结构研究所; 马德里自治大学尼古拉斯·卡布雷拉研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究在三维扩展Bernevig-Hughes-Zhang框架下，证实磁性掺杂拓扑异质结构可产生多重手性马约拉纳模式，推导了相关解析判据，为拓扑量子计算提供了有前景的平台。
AI 中文摘要
实现具有多个马约拉纳通道的鲁棒拓扑超导电性是可扩展拓扑量子计算的关键步骤。为此，我们在充分考虑垂直限域的全三维扩展Bernevig-Hughes-Zhang框架内，研究了由s波超导体邻近耦合的磁性掺杂三维拓扑绝缘体异质结构。我们表明，磁交换耦合、轨道混合与体带反转协同作用，可生成支持多重手性马约拉纳模式的有效等自旋p波配对通道。马约拉纳通道的数量由垂直方向的限域模式和正常态的高陈数相决定，这使我们能够推导多重马约拉纳拓扑超导相出现的解析判据。手性马约拉纳模式对强无序和适度的对称性破缺扰动保持鲁棒性。我们还证明，定义垂直约瑟夫森结的超导相位差是控制低能马约拉纳通道的杂化、微隙和有效多重性的可调参数。我们的结果确立了磁性三维拓扑绝缘体异质结构是工程化多重手性马约拉纳模式的有前景平台。
英文摘要
Achieving robust topological superconductivity with multiple Majorana channels is a key step for scalable topological quantum computing. To this end, we investigate magnetically doped three-dimensional topological insulator heterostructures proximitized by an s-wave superconductor within a fully three-dimensional extended Bernevig-Hughes-Zhang framework that explicitly accounts for vertical confinement. We show that magnetic exchange coupling, orbital mixing, and bulk band inversion cooperate to generate effective equal-spin p-wave pairing channels supporting multiple chiral Majorana modes. The number of Majorana channels is determined by the confined modes in the vertical direction and the high-Chern-number phases of the normal state, which allows us to derive an analytical criterion for the emergence of the multiple-Majorana topological superconducting phases. The chiral Majorana modes remain robust against strong disorder and moderate symmetry-breaking perturbations. We also demonstrate that a superconducting phase difference defining a vertical Josephson junction acts as a tunable parameter that controls the hybridization, minigap, and effective multiplicity of the low energy Majorana channels. Our results establish magnetic three-dimensional topological- insulator heterostructures as a promising platform for engineering multiple chiral Majorana modes.
Comments26 pages, 7+3 Figures
