Hsieh, D. and McIver, J. W. and Torchinsky, D. H. and Gardner, D. R. and Lee, Y. S. and Gedik, N. (2011) Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator. Physical Review Letters, 106 (5). Art. No. 057401 . ISSN 0031-9007. doi:10.1103/PhysRevLett.106.057401. https://resolver.caltech.edu/CaltechAUTHORS:20140815-131510654
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Abstract
We use ultrafast laser pulses to experimentally demonstrate that the second-order optical response of bulk single crystals of the topological insulator Bi_2Se_3 is sensitive to its surface electrons. By performing surface doping dependence measurements as a function of photon polarization and sample orientation we show that second harmonic generation can simultaneously probe both the surface crystalline structure and the surface charge of Bi_2Se_3. Furthermore, we find that second harmonic generation using circularly polarized photons reveals the time-reversal symmetry properties of the system and is surprisingly robust against surface charging, which makes it a promising tool for spectroscopic studies of topological surfaces and buried interfaces.
| Item Type: | Article | |||||||||
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| Additional Information: | © 2011 American Physical Society. Received 4 December 2010. Published 1 February 2011. Supported by D.O.E. Grant No. DE-FG02-08ER46521. | |||||||||
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| Issue or Number: | 5 | |||||||||
| Classification Code: | PACS numbers: 78.68.+m, 03.65.Vf, 71.70.Ej, 78.47.J | |||||||||
| DOI: | 10.1103/PhysRevLett.106.057401 | |||||||||
| Record Number: | CaltechAUTHORS:20140815-131510654 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140815-131510654 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 48621 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Joy Painter | |||||||||
| Deposited On: | 19 Aug 2014 23:08 | |||||||||
| Last Modified: | 10 Nov 2021 18:33 |
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