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Observation of a Warped Helical Spin Texture in Bi_2Se_3 from Circular Dichroism Angle-Resolved Photoemission Spectroscopy

Wang, Y. H. and Hsieh, D. and Pilon, D. and Fu, L. and Gardner, D. R. and Lee, Y. S. and Gedik, N. (2011) Observation of a Warped Helical Spin Texture in Bi_2Se_3 from Circular Dichroism Angle-Resolved Photoemission Spectroscopy. Physical Review Letters, 107 (20). Art. No. 207602. ISSN 0031-9007. doi:10.1103/PhysRevLett.107.207602.

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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_2Se_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.

Item Type:Article
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Hsieh, D.0000-0002-0812-955X
Alternate Title:Observation of a Warped Helical Spin Texture in Bi2Se3 from Circular Dichroism Angle-Resolved Photoemission Spectroscopy
Additional Information:© 2011 American Physical Society Received 18 August 2011. Published 11 November 2011. This research is supported by Department of Energy Grant number DE-FG02-08ER46521, Army Research Office (ARO-DURIP) Grant number W911NF-09-1-0170 (ARTOF spectrometer) and in part by the MRSEC Program of the National Science Foundation under Grant number DMR - 0819762 (partial support for Y. H.W.).
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-08ER46521
Army Research Office (ARO)W911NF-09-1-0170
Issue or Number:20
Classification Code:PACS numbers: 79.60.i, 71.70.Ej, 73.20.At
Record Number:CaltechAUTHORS:20140813-121709306
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48511
Deposited By: Joy Painter
Deposited On:13 Aug 2014 19:31
Last Modified:10 Nov 2021 18:32

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