Observation of a Warped Helical Spin Texture in Bi2Se3 from Circular Dichroism Angle-Resolved Photoemission Spectroscopy

被引:183
作者
Wang, Y. H. [1 ,2 ]
Hsieh, D. [1 ]
Pilon, D. [1 ]
Fu, L. [2 ]
Gardner, D. R. [1 ]
Lee, Y. S. [1 ]
Gedik, N. [1 ]
机构
[1] MIT, Dept Phys, Cambridge, MA 02139 USA
[2] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
基金
美国国家科学基金会;
关键词
SINGLE DIRAC CONE; TOPOLOGICAL INSULATORS; POLARIZED-LIGHT; SURFACE; BI2TE3;
D O I
10.1103/PhysRevLett.107.207602
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A differential coupling of topological surface states to left-versus right-circularly polarized light is the basis of many optospintronics applications of topological insulators. Here we report direct evidence of circular dichroism from the surface states of Bi2Se3 using laser-based time-of-flight angle-resolved photoemission spectroscopy. By employing a novel sample rotational analysis, we resolve unusual modulations in the circular dichroism photoemission pattern as a function of both energy and momentum, which perfectly mimic the predicted but hitherto unobserved three-dimensional warped spin texture of the surface states. By developing a microscopic theory of photoemission from topological surface states, we show that this correlation is a natural consequence of spin-orbit coupling. These results suggest that our technique may be a powerful probe of the spin texture of spin-orbit coupled materials in general.
引用
收藏
页数:5
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