Indexed by: Journal paper

First Author: Zhijun Wang

Correspondence Author: Zhong Fang,Xi Dai,Hong Ding

Co-author: Alexei V Fedorov,P Richard,Hongming Weng,Tian Qian,Xiaoyan Xu,Hu Miao,LK Zeng,Gang Xu,Peng Zhang

Journal: Physical Review B

Included Journals: SCI

Discipline: Science

First-Level Discipline: Physics

Document Type: J

Volume: 92

Issue: 11

Page Number: 115119

ISSN No.: 1098-0121

Date of Publication: 2015-09-08

Impact Factor: 3.718

Abstract: We demonstrate, using first-principles calculations, that the electronic structure of FeSe 1− x Te x (x= 0.5) is topologically nontrivial and characterized by an odd Z 2 invariant and Dirac cone type surface states, in sharp contrast to the end member FeSe (x= 0). This topological state is induced by the enhanced three-dimensionality and spin-orbit coupling due to Te substitution (compared to FeSe), and characterized by a band inversion at the Z point of the Brillouin zone, which is confirmed by our ARPES measurements. The results suggest that the surface of FeSe 0.5 Te 0.5 may support a nontrivial superconducting channel in proximity to the bulk.

Links to published journals: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.115119