Photoemission Spectroscopy of Magnetic and Nonmagnetic Impurities on the Surface of the Bi2Se3 Topological Insulator

被引：181

作者：

Valla, T. ^{[1
]}

Pan, Z. -H. ^{[1
]}

Gardner, D. ^{[2
]}

Lee, Y. S. ^{[2
]}

Chu, S. ^{[3
]}

机构：

[1] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[2] MIT, Dept Phys, Cambridge, MA 02139 USA

[3] MIT, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 11期

关键词：

TRANSPORT; BI2TE3; STATE;

D O I：

10.1103/PhysRevLett.108.117601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Dirac-like surface states on surfaces of topological insulators have a chiral spin structure that suppresses backscattering and protects the coherence of these states in the presence of nonmagnetic scatterers. In contrast, magnetic scatterers should open the backscattering channel via the spin-flip processes and degrade the state's coherence. We present angle-resolved photoemission spectroscopy studies of the electronic structure and the scattering rates upon the adsorption of various magnetic and nonmagnetic impurities on the surface of Bi2Se3, a model topological insulator. We reveal a remarkable insensitivity of the topological surface state to both nonmagnetic and magnetic impurities in the low impurity concentration regime. Scattering channels open up with the emergence of hexagonal warping in the high-doping regime, irrespective of the impurity's magnetic moment.

引用

页数：5

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