Observation of a Warped Helical Spin Texture in Bi[subscript 2]Se[subscript 3] from Circular Dichroism Angle-Resolved Photoemission Spectroscopy
Name
Wang-2011-Observation of aWarped Helical Spin Texture in.pdf
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Author(s)
Wang, Y. H.
Hsieh, David
Pilon, Daniel Victor
Fu, Liang
Gardner, Dillon Richard
Gedik, Nuh
Lee, Young S.
Alternative Title
Observation of a Warped Helical Spin Texture in Bi2Se3 from Circular Dichroism Angle-Resolved Photoemission Spectroscopy
Date Issued
November 2011
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Wang, Y. et al. “Observation of a Warped Helical Spin Texture in Bi_{2}Se_{3} from Circular Dichroism Angle-Resolved Photoemission Spectroscopy.” Physical Review Letters 107.20 (2011): n. pag. Web. 8 Mar. 2012. © 2011 American Physical Society
Version
Final published version
Abstract
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 Bi[subscript 2]Se[subscript 3] 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.107.207602
