Topological nature of the FeSe0.5Te0.5 superconductor

被引：249

作者：

Wang, Zhijun ^{[1
,2
,3
]}

Zhang, P. ^{[1
,2
]}

Xu, Gang ^{[1
,2
,4
]}

Zeng, L. K. ^{[1
,2
]}

Miao, H. ^{[1
,2
]}

Xu, Xiaoyan ^{[1
,2
]}

Qian, T. ^{[1
,2
]}

Weng, Hongming ^{[1
,2
,5
]}

Richard, P. ^{[1
,2
]}

Fedorov, A. V. ^{[6
]}

Ding, H. ^{[1
,2
,5
]}

Dai, Xi ^{[1
,2
,5
]}

Fang, Zhong ^{[1
,2
,5
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[3] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[4] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[5] Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China

[6] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 11期

关键词：

PHASE-DIAGRAM; IRON; FESE;

D O I：

10.1103/PhysRevB.92.115119

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We demonstrate, using first-principles calculations, that the electronic structure of FeSe1-xTex (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 FeSe0.5Te0.5 may support a nontrivial superconducting channel in proximity to the bulk.

引用

页数：7

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