Observation of Dirac surface states in the noncentrosymmetric superconductor BiPd

被引：23

作者：

Benia, H. M. ^{[1
]}

Rampi, E. ^{[2
]}

Trainer, C. ^{[3
]}

Yim, C. M. ^{[3
]}

Maldonado, A. ^{[3
]}

Peets, D. C. ^{[1
,4
]}

Stoehr, A. ^{[1
]}

Starke, U. ^{[1
]}

Kern, K. ^{[1
,5
]}

Yaresko, A. ^{[1
]}

Levy, G. ^{[2
,6
]}

Damascelli, A. ^{[2
,6
]}

Ast, C. R. ^{[1
]}

Schnyder, A. P. ^{[1
]}

Wahl, P. ^{[1
,3
]}

机构：

[1] Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany

[2] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[3] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

[4] Fudan Univ, Adv Mat Lab, Shanghai 200438, Peoples R China

[5] Ecole Polytech Fed Lausanne, Inst Phys, CH-1015 Lausanne, Switzerland

[6] Univ British Columbia, Quantum Matter Inst, Vancouver, BC V6T 1Z4, Canada

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

TOPOLOGICAL-INSULATOR; CRYSTAL-STRUCTURE; PLANE;

D O I：

10.1103/PhysRevB.94.121407

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Materials with strong spin-orbit coupling (SOC) have in recent years become a subject of intense research due to their potential applications in spintronics and quantum information technology. In particular, in systems which break inversion symmetry, SOC facilitates the Rashba-Dresselhaus effect, leading to a lifting of spin degeneracy in the bulk and intricate spin textures of the Bloch wave functions. Here, by combining angular resolved photoemission spectroscopy and low temperature scanning tunneling microscopy measurements with relativistic first-principles band structure calculations, we examine the role of SOC in single crystals of noncentrosymmetric BiPd. We report the detection of several Dirac surface states, one of which exhibits an extremely large spin splitting. Unlike the surface states in inversion-symmetric systems, the Dirac surface states of BiPd have completely different properties at opposite faces of the crystal and are not trivially linked by symmetry. The spin splitting of the surface states exhibits a strong anisotropy by itself, which can be linked to the low in-plane symmetry of the surface termination.

引用

页数：5

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