Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator
We use ultrafast laser pulses to experimentally demonstrate that the second-order optical response of bulk single crystals of the topological insulator Bi2Se3 is sensitive to its surface electrons. By performing surface doping dependence measurements as a function of photon polarization and sample o...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/63097 https://orcid.org/0000-0003-2226-6443 https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0002-7022-8313 https://orcid.org/0000-0002-0042-9195 |
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| author | Hsieh, David McIver, James Torchinsky, Darius Hosseinzadeh Gardner, Dillon Richard Lee, Young S. Gedik, Nuh |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Hsieh, David McIver, James Torchinsky, Darius Hosseinzadeh Gardner, Dillon Richard Lee, Young S. Gedik, Nuh |
| author_sort | Hsieh, David |
| collection | MIT |
| description | We use ultrafast laser pulses to experimentally demonstrate that the second-order optical response of bulk single crystals of the topological insulator Bi2Se3 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 Bi2Se3. 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. |
| first_indexed | 2024-09-23T13:36:13Z |
| format | Article |
| id | mit-1721.1/63097 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:36:13Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/630972022-09-28T14:56:11Z Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator Hsieh, David McIver, James Torchinsky, Darius Hosseinzadeh Gardner, Dillon Richard Lee, Young S. Gedik, Nuh Massachusetts Institute of Technology. Department of Physics Gedik, Nuh Gedik, Nuh Hsieh, David Torchinsky, Darius Hosseinzadeh Gardner, Dillon Richard Lee, Young S. We use ultrafast laser pulses to experimentally demonstrate that the second-order optical response of bulk single crystals of the topological insulator Bi2Se3 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 Bi2Se3. 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. United States. Dept. of Energy (D.O.E. Grant No. DE-FG02-08ER46521) 2011-05-24T18:54:01Z 2011-05-24T18:54:01Z 2011-02 2010-12 Article http://purl.org/eprint/type/JournalArticle 0031-9007 http://hdl.handle.net/1721.1/63097 Hsieh, D. et al. "Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator." Phys. Rev. Lett. 106:5, 057401 (2011) © 2011 American Physical Society. https://orcid.org/0000-0003-2226-6443 https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0002-7022-8313 https://orcid.org/0000-0002-0042-9195 en_US http://dx.doi.org/10.1103/PhysRevLett.106.057401 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Hsieh, David McIver, James Torchinsky, Darius Hosseinzadeh Gardner, Dillon Richard Lee, Young S. Gedik, Nuh Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator |
| title | Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator |
| title_full | Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator |
| title_fullStr | Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator |
| title_full_unstemmed | Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator |
| title_short | Nonlinear Optical Probe of Tunable Surface Electrons on a Topological Insulator |
| title_sort | nonlinear optical probe of tunable surface electrons on a topological insulator |
| url | http://hdl.handle.net/1721.1/63097 https://orcid.org/0000-0003-2226-6443 https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0002-7022-8313 https://orcid.org/0000-0002-0042-9195 |
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