Chen Xiaoyu, Chen Mingyang, Duan Wen, Yang Huan, Wen Hai-Hu
National Laboratory of Solid State Microstructures and Department of Physics, Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China.
Nano Lett. 2020 May 13;20(5):2965-2972. doi: 10.1021/acs.nanolett.9b04639. Epub 2020 Apr 21.
Topological superconductivity is one of the frontier research directions in condensed matter physics. One of the unique elementary excitations in topological superconducting state is the Majorana Fermion (mode) which is its own antiparticle and obeys the non-Abelian statistics and is thus useful for constructing the fault-tolerant quantum computation. The evidence for Majorana Fermions (mode) in condensed matter is now quickly accumulated. We deposit Bi islands on the iron-based superconductors Fe(Te,Se) and find the easily achievable zero energy modes on the tunneling spectra on some Bi islands. The zero energy mode is robust and appears everywhere on the island. Temperature and magnetic field dependence of the zero energy mode are also investigated. We attribute these zero energy modes to the Majorana modes due to the proximity effect-induced topological superconductivity on the Bi islands with strong spin-orbit coupling effect.
拓扑超导是凝聚态物理的前沿研究方向之一。拓扑超导态中独特的元激发之一是马约拉纳费米子（模式），它是自身的反粒子，遵循非阿贝尔统计，因此对于构建容错量子计算很有用。凝聚态中马约拉纳费米子（模式）的证据目前正在迅速积累。我们在铁基超导体Fe(Te,Se)上沉积铋岛，并在一些铋岛上的隧穿谱中发现了易于实现的零能模式。零能模式很稳健，出现在岛上的各处。还研究了零能模式的温度和磁场依赖性。由于具有强自旋轨道耦合效应的铋岛上的近邻效应诱导的拓扑超导，我们将这些零能模式归因于马约拉纳模式。
