Topological nature of the FeSe0.5Te0.5 superconductor

Zhijun Wang; P. Zhang; Gang Xu; L. K. Zeng; H. Miao; Xiaoyan Xu; T. Qian; Hongming Weng; P. Richard; A. V. Fedorov; H. Ding; Xi Dai; Zhong Fang

doi:10.1103/PhysRevB.92.115119

Topological nature of the FeSe0.5Te0.5 superconductor

Zhijun Wang
, P. Zhang
, Gang Xu
, L. K. Zeng
, H. Miao
, Xiaoyan Xu
, T. Qian
, Hongming Weng
, P. Richard
, A. V. Fedorov
, H. Ding
, Xi Dai
, Zhong Fang

Research output: Contribution to journal › Article › peer-review

276 Scopus citations

Abstract

We demonstrate, using first-principles calculations, that the electronic structure of FeSe1-xTex(x=0.5) is topologically nontrivial and characterized by an odd Z2 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 FeSe0.5Te0.5 may support a nontrivial superconducting channel in proximity to the bulk.

Original language	English
Article number	115119
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	92
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevB.92.115119
State	Published - Sep 8 2015
Externally published	Yes

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title = "Topological nature of the FeSe0.5Te0.5 superconductor",

abstract = "We demonstrate, using first-principles calculations, that the electronic structure of FeSe1-xTex(x=0.5) is topologically nontrivial and characterized by an odd Z2 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 FeSe0.5Te0.5 may support a nontrivial superconducting channel in proximity to the bulk.",

author = "Zhijun Wang and P. Zhang and Gang Xu and Zeng, \{L. K.\} and H. Miao and Xiaoyan Xu and T. Qian and Hongming Weng and P. Richard and Fedorov, \{A. V.\} and H. Ding and Xi Dai and Zhong Fang",

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year = "2015",

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doi = "10.1103/PhysRevB.92.115119",

language = "English",

volume = "92",

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TY - JOUR

T1 - Topological nature of the FeSe0.5Te0.5 superconductor

AU - Wang, Zhijun

AU - Zhang, P.

AU - Xu, Gang

AU - Zeng, L. K.

AU - Miao, H.

AU - Xu, Xiaoyan

AU - Qian, T.

AU - Weng, Hongming

AU - Richard, P.

AU - Fedorov, A. V.

AU - Ding, H.

AU - Dai, Xi

AU - Fang, Zhong

PY - 2015/9/8

Y1 - 2015/9/8

N2 - We demonstrate, using first-principles calculations, that the electronic structure of FeSe1-xTex(x=0.5) is topologically nontrivial and characterized by an odd Z2 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 FeSe0.5Te0.5 may support a nontrivial superconducting channel in proximity to the bulk.

AB - We demonstrate, using first-principles calculations, that the electronic structure of FeSe1-xTex(x=0.5) is topologically nontrivial and characterized by an odd Z2 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 FeSe0.5Te0.5 may support a nontrivial superconducting channel in proximity to the bulk.

UR - https://www.scopus.com/pages/publications/84942475039

U2 - 10.1103/PhysRevB.92.115119

DO - 10.1103/PhysRevB.92.115119

M3 - Article

AN - SCOPUS:84942475039

SN - 1098-0121

VL - 92

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 11

M1 - 115119

ER -

Topological nature of the FeSe0.5Te0.5 superconductor

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