Indexed by: Journal paper

First Author: 徐刚

Correspondence Author: 张首晟

Co-author: Gang Xu, Biao Lian, Peizhe Tang, Xiao-Liang Qi, Shou-Cheng Zhang

Journal: Phys. Rev. Lett.

Included Journals: SCI

Discipline: Science

First-Level Discipline: Physics

Document Type: J

Volume: 117

Page Number: 047110

Date of Publication: 2016-07-25

Abstract: 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.