AI 中文总结
本文通过掺杂调控在失配层状化合物中实现了从普通到拓扑超导的相变，并揭示了非单调相图及拓扑序参量特征，为拓扑超导工程提供了新平台。
AI 中文摘要
实现拓扑超导是量子物理中的一个关键目标，为容错量子计算机提供了一条途径。该领域的一个核心挑战是连续驱动材料经历拓扑量子相变，以直接观察从普通超导到拓扑超导的演化过程。然而，找到一个能够实现这种极端且精确调制的稳健平台仍然是一个挑战。在此，我们展示了在块体失配层状化合物(LaxPb1-xSe)1.14(NbSe2)2中，通过掺杂控制的从普通超导态到拓扑超导态的相变。我们揭示了一个非单调的相图，其特征是两个不同的超导区域被一个在精确掺杂下的非超导相所分隔。在高掺杂区域，超导相对非磁性无序变得异常敏感，并且在原子台阶边缘出现了取向选择性的隙内模式。在Bogoliubov-de Gennes计算的支持下，这些涌现的空间特征与一个时间反演对称的晶体拓扑序参量一致。我们的结果确立了失配化合物作为工程化拓扑超导的平台。
英文摘要
Achieving topological superconductivity is a key goal in quantum physics, offering a path to fault-tolerant quantum computers. A central challenge in this field is to continuously drive a material through a topological quantum phase transition to directly observe the evolution from trivial to topological superconductivity. However, finding a robust platform that allows such extreme and precise tuning remains a challenge. Here, we demonstrate a doping-controlled phase transition from a conventional to a topological superconducting state in the bulk misfit layer compound (LaxPb1-xSe)1.14(NbSe2)2. We reveal a non-monotonic phase diagram characterized by two distinct superconducting regimes separated by a non-superconducting phase at a precise doping. In the highly doped regime, the superconducting phase becomes remarkably sensitive to non-magnetic disorder, and orientation-selective in-gap modes emerge at atomic step edges. Supported by Bogoliubov-de Gennes calculations, these emergent spatial signatures are consistent with a time-reversal-symmetric crystalline-topological order parameter. Our results establish misfit compounds as a platform to engineering topological superconductivity.
