Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators
Topological insulators are a new phase of matter that exhibits exotic surface electronic properties. Determining the spin texture of this class of material is of paramount importance for both fundamental understanding of its topological order and future spin-based applications. In this article, we r...
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| Format: | Article |
| Language: | en_US |
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John Wiley & Sons, Inc
2014
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| Online Access: | http://hdl.handle.net/1721.1/88442 https://orcid.org/0000-0002-6394-4987 |
| _version_ | 1826212983496245248 |
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| author | Wang, Yihua Gedik, Nuh |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Wang, Yihua Gedik, Nuh |
| author_sort | Wang, Yihua |
| collection | MIT |
| description | Topological insulators are a new phase of matter that exhibits exotic surface electronic properties. Determining the spin texture of this class of material is of paramount importance for both fundamental understanding of its topological order and future spin-based applications. In this article, we review the recent experimental and theoretical studies on the differential coupling of left-circularly versus right-circularly polarized light to the topological surface states in angle-resolved photoemission spectroscopy. These studies have shown that the polarization of light and the experimental geometry play a veryimportant role in both photocurrent intensity and spin polarization of photoelectrons emitted from the topological surface states. A general photoemission matrix element calculation can quantitatively explain the observations and is also applicable to topologically trivial systems with strong spin–orbit coupling. These experimental and theoretical investigations suggest that optical excitation with circularly polarized light is a promising route towards mapping the spin–orbit texture and manipulating the spin orientation in topological and other spin–orbit coupled materials.
The circular-dichroic angle-resolved photoemission spectrum of Bi2Se3 as obtained by the difference between spectra taken with left-circularly vs. right-circularly polarized light using a time-of-flight electron spectrometer. |
| first_indexed | 2024-09-23T15:41:15Z |
| format | Article |
| id | mit-1721.1/88442 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:41:15Z |
| publishDate | 2014 |
| publisher | John Wiley & Sons, Inc |
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| spelling | mit-1721.1/884422022-10-02T03:25:46Z Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators Wang, Yihua Gedik, Nuh Massachusetts Institute of Technology. Department of Physics Wang, Yihua Gedik, Nuh Topological insulators are a new phase of matter that exhibits exotic surface electronic properties. Determining the spin texture of this class of material is of paramount importance for both fundamental understanding of its topological order and future spin-based applications. In this article, we review the recent experimental and theoretical studies on the differential coupling of left-circularly versus right-circularly polarized light to the topological surface states in angle-resolved photoemission spectroscopy. These studies have shown that the polarization of light and the experimental geometry play a veryimportant role in both photocurrent intensity and spin polarization of photoelectrons emitted from the topological surface states. A general photoemission matrix element calculation can quantitatively explain the observations and is also applicable to topologically trivial systems with strong spin–orbit coupling. These experimental and theoretical investigations suggest that optical excitation with circularly polarized light is a promising route towards mapping the spin–orbit texture and manipulating the spin orientation in topological and other spin–orbit coupled materials. The circular-dichroic angle-resolved photoemission spectrum of Bi2Se3 as obtained by the difference between spectra taken with left-circularly vs. right-circularly polarized light using a time-of-flight electron spectrometer. United States. Dept. of Energy (Office of Basic Energy Sciences, Grant number DE-FG02-08ER46521) United States. Dept. of Energy (Office of Basic Energy Sciences, Grant number DE-SC0006423) United States. Army Research Office ((ARO- DURIP) Grant number W911NF-09-1-0170) Alfred P. Sloan Foundation 2014-07-18T15:00:57Z 2014-07-18T15:00:57Z 2013-02 2013-01 Article http://purl.org/eprint/type/JournalArticle 18626254 1862-6270 http://hdl.handle.net/1721.1/88442 Wang, Yihua, and Nuh Gedik. “Circular Dichroism in Angle-Resolved Photoemission Spectroscopy of Topological Insulators.” Physica Status Solidi (RRL) - Rapid Research Letters 7, no. 1–2 (February 2013): 64–71. https://orcid.org/0000-0002-6394-4987 en_US http://dx.doi.org/10.1002/pssr.201206458 Physica status solidi. RRL, rapid research letters Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf John Wiley & Sons, Inc arXiv |
| spellingShingle | Wang, Yihua Gedik, Nuh Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators |
| title | Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators |
| title_full | Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators |
| title_fullStr | Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators |
| title_full_unstemmed | Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators |
| title_short | Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators |
| title_sort | circular dichroism in angle resolved photoemission spectroscopy of topological insulators |
| url | http://hdl.handle.net/1721.1/88442 https://orcid.org/0000-0002-6394-4987 |
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