Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator
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.
Additional Information
© 2011 American Physical Society. Received 4 December 2010. Published 1 February 2011. Supported by D.O.E. Grant No. DE-FG02-08ER46521.Attached Files
Published - PhysRevLett.106.057401.pdf
Supplemental Material - ARR_SHG_PRLAM_1-24-2011.pdf
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Additional details
- Eprint ID
- 48621
- Resolver ID
- CaltechAUTHORS:20140815-131510654
- DE-FG02-08ER46521
- Department of Energy (DOE)
- Created
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2014-08-19Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field