An iron home for Majoranas The surface of the iron-based superconductor FeTe0.55Se0.45 has been identified as a potential topological superconductor and is expected to host exotic quasiparticles called the Majorana bound states (MBSs). Wang et al. looked for signatures of MBSs in this material by using scanning tunneling spectroscopy on the vortex cores formed by the application of a magnetic field. In addition to conventional states, they observed the characteristic zero-bias peaks associated with MBSs and were able to distinguish between the two, owing to the favorable ratios of energy scales in the system. Science, this issue p. 333 Scanning tunneling spectroscopy reveals signatures of Majorana bound states on the surface of FeTe1−xSex. The search for Majorana bound states (MBSs) has been fueled by the prospect of using their non-Abelian statistics for robust quantum computation. Two-dimensional superconducting topological materials have been predicted to host MBSs as zero-energy modes in vortex cores. By using scanning tunneling spectroscopy on the superconducting Dirac surface state of the iron-based superconductor FeTe0.55Se0.45, we observed a sharp zero-bias peak inside a vortex core that does not split when moving away from the vortex center. The evolution of the peak under varying magnetic field, temperature, and tunneling barrier is consistent with the tunneling to a nearly pure MBS, separated from nontopological bound states. This observation offers a potential platform for realizing and manipulating MBSs at a relatively high temperature.

中文翻译：

---

铁基超导体中马约拉纳束缚态的证据

Majoranas 的铁家 铁基超导体 FeTe0.55Se0.45 的表面已被确定为一种潜在的拓扑超导体，并有望容纳称为 Majorana 束缚态 (MBS) 的奇异准粒子。王等人。通过在施加磁场形成的涡旋核上使用扫描隧道光谱，寻找这种材料中 MBS 的特征。除了常规状态外，他们还观察到与 MBS 相关的特征性零偏峰，并且由于系统中能量比例的有利比例，他们能够区分两者。科学，这个问题 p。333 扫描隧道光谱揭示了 FeTe1-xSex 表面上马约拉纳束缚态的特征。使用非阿贝尔统计进行稳健量子计算的前景推动了对马约拉纳束缚态 (MBS) 的探索。二维超导拓扑材料已被预测作为涡核中的零能量模式承载 MBS。通过对铁基超导体 FeTe0.55Se0.45 的超导狄拉克表面态使用扫描隧道光谱，我们观察到涡核内部出现一个尖锐的零偏峰，该峰在远离涡旋中心时不会分裂。在不同磁场、温度和隧穿势垒下峰的演变与隧穿到几乎纯 MBS 的过程一致，与非拓扑束缚态分离。这一观察为在相对较高的温度下实现和操纵 MBS 提供了一个潜在的平台。