论文类型：期刊论文
第一作者：徐刚
通讯作者：张首晟
合写作者：Gang Xu, Biao Lian, Peizhe Tang, Xiao-Liang Qi, Shou-Cheng Zhang
发表刊物：Phys. Rev. Lett.
收录刊物：SCI
学科门类：理学
一级学科：物理学
文献类型：J
卷号：117
页面范围：047110
发表时间：2016-07-25
摘要：As one of the simplest systems for realizing Majorana fermions, the topological superconductor plays an important role in both condensed matter physics and quantum computations. Based on ab initio calculations and the analysis of an effective 8-band model with superconducting pairing, we demonstrate that the three-dimensional extended s-wave Fe-based superconductors such as Fe 1+ y Se 0.5 Te 0.5 have a metallic topologically nontrivial band structure, and exhibit a normal-topological-normal superconductivity phase transition on the (001) surface by tuning the bulk carrier doping level.