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Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator

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.

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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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Hsieh, D.0000-0002-0812-955X
Additional Information:© 2011 American Physical Society. Received 4 December 2010. Published 1 February 2011. Supported by D.O.E. Grant No. DE-FG02-08ER46521.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-08ER46521
Issue or Number:5
Classification Code:PACS numbers: 78.68.+m, 03.65.Vf, 71.70.Ej, 78.47.J
Record Number:CaltechAUTHORS:20140815-131510654
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48621
Deposited By: Joy Painter
Deposited On:19 Aug 2014 23:08
Last Modified:10 Nov 2021 18:33

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