论文标题
从第一原理中的Mn掺杂Gete单层中的内在拓扑超导性的预测
Prediction of intrinsic topological superconductivity in Mn-doped GeTe monolayer from first-principles
论文作者
论文摘要
最近发现拓扑超导体（TSC）引起了极大的兴趣。实现TSC需要对多个微观参数进行微妙的调整，这仍然是一个巨大的挑战。在这里，我们通过在Rashba Spin-Spin-Orbit耦合，Zeeman拆分和电子 - phonon耦合的情况下，基于宽度型结构的构建，基于含量结构构建的自愿bogoliubov-de Gennes方程来开发一种原理方法来量化TSC的现实条件。我们通过预测Mn掺杂的Gete（ge $ _ {1 -x} $ mn $ _x $ _x $ te）单层 - 一种众所周知的稀释磁性半导体，显示孔掺杂下的超导性 - 是DSC的dsc tsc，Chern and chern and chiral groada Moderes均表现出较高的超导性。通过在温度和MN浓度的参数空间中构建第一原理相图，我们提出的TSC相可以在低约40 mk的较低限值过渡温度下诱导，而MN浓度为$ x $ 〜0.015％。我们的方法通常可以通过语音介导的配对应用于TSC，为将来的实验提供了有用的指导。
Recent discovery of topological superconductors (TSCs) has sparked enormous interest. Realization of TSC requires a delicate tuning of multiple microscopic parameters, which remains a great challenge. Here, we develop a first-principles approach to quantify realistic conditions of TSC by solving self-consistently Bogoliubov-de Gennes equation based on Wannier function construction of band structure, in presence of Rashba spin-orbit coupling, Zeeman splitting and electron-phonon coupling. We further demonstrate the power of this new method by predicting the Mn-doped GeTe (Ge$_{1-x}$Mn$_x$Te) monolayer - a well-known dilute magnetic semiconductor showing superconductivity under hole doping - to be a Class D TSC with Chern number of -1 and chiral Majorana edge modes. By constructing a first-principles phase diagram in the parameter space of temperature and Mn concentration, we propose the TSC phase can be induced at a lower-limit transition temperature of ~40 mK and the Mn concentration of $x$~0.015%. Our approach can be generally applied to TSCs with a phonon-mediated pairing, providing useful guidance for future experiments.
