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

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257 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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doi = "10.1103/PhysRevB.92.115119",

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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.

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U2 - 10.1103/PhysRevB.92.115119

DO - 10.1103/PhysRevB.92.115119

M3 - Article

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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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