Observation of suppressed terahertz absorption in photoexcited graphene
When light is absorbed by a semiconductor, photoexcited charge carriers enhance the absorption of far-infrared radiation due to intraband transitions. We observe the opposite behavior in monolayer graphene, a zero-gap semiconductor with linear dispersion. By using time domain terahertz (THz) spectro...
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| Format: | Article |
| Language: | en_US |
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American Institute of Physics (AIP)
2014
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| Online Access: | http://hdl.handle.net/1721.1/87105 https://orcid.org/0000-0002-3416-3962 https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0003-0551-1208 https://orcid.org/0000-0002-7406-5283 https://orcid.org/0000-0001-8217-8213 |
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| author | Frenzel, Alex James Lui, Chun Hung Fang, Wenjing Nair, Nityan L. Herring, Patrick Kenichi Jarillo-Herrero, Pablo Kong, Jing Gedik, Nuh |
| author2 | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science |
| author_facet | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Frenzel, Alex James Lui, Chun Hung Fang, Wenjing Nair, Nityan L. Herring, Patrick Kenichi Jarillo-Herrero, Pablo Kong, Jing Gedik, Nuh |
| author_sort | Frenzel, Alex James |
| collection | MIT |
| description | When light is absorbed by a semiconductor, photoexcited charge carriers enhance the absorption of far-infrared radiation due to intraband transitions. We observe the opposite behavior in monolayer graphene, a zero-gap semiconductor with linear dispersion. By using time domain terahertz (THz) spectroscopy in conjunction with optical pump excitation, we observe a reduced absorption of THz radiation in photoexcited graphene. The measured spectral shape of the differential optical conductivity exhibits non-Drude behavior. We discuss several possible mechanisms that contribute to the observed low-frequency non-equilibrium optical response of graphene. |
| first_indexed | 2024-09-23T11:15:37Z |
| format | Article |
| id | mit-1721.1/87105 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:15:37Z |
| publishDate | 2014 |
| publisher | American Institute of Physics (AIP) |
| record_format | dspace |
| spelling | mit-1721.1/871052022-10-01T02:23:39Z Observation of suppressed terahertz absorption in photoexcited graphene Frenzel, Alex James Lui, Chun Hung Fang, Wenjing Nair, Nityan L. Herring, Patrick Kenichi Jarillo-Herrero, Pablo Kong, Jing Gedik, Nuh Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology. Department of Physics Frenzel, Alex James Lui, Chun Hung Fang, Wenjing Nair, Nityan L. Herring, Patrick Kenichi Jarillo-Herrero, Pablo Kong, Jing Gedik, Nuh When light is absorbed by a semiconductor, photoexcited charge carriers enhance the absorption of far-infrared radiation due to intraband transitions. We observe the opposite behavior in monolayer graphene, a zero-gap semiconductor with linear dispersion. By using time domain terahertz (THz) spectroscopy in conjunction with optical pump excitation, we observe a reduced absorption of THz radiation in photoexcited graphene. The measured spectral shape of the differential optical conductivity exhibits non-Drude behavior. We discuss several possible mechanisms that contribute to the observed low-frequency non-equilibrium optical response of graphene. United States. Dept. of Energy. Office of Basic Energy Sciences (Grant DE-SC0006423) National Science Foundation (U.S.). Graduate Research Fellowship Program United States. Air Force Office of Scientific Research United States. Office of Naval Research. Multidisciplinary University Research Initiative. Graphene Approaches to Terahertz Electronics National Science Foundation (U.S.) (Award DMR-0819762) National Science Foundation (U.S.) (Grant ECS-0335765) 2014-05-22T18:22:29Z 2014-05-22T18:22:29Z 2013-03 2013-01 Article http://purl.org/eprint/type/JournalArticle 00036951 1077-3118 http://hdl.handle.net/1721.1/87105 Frenzel, A. J., C. H. Lui, W. Fang, N. L. Nair, P. K. Herring, P. Jarillo-Herrero, J. Kong, and N. Gedik. “Observation of Suppressed Terahertz Absorption in Photoexcited Graphene.” Appl. Phys. Lett. 102, no. 11 (2013): 113111. https://orcid.org/0000-0002-3416-3962 https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0003-0551-1208 https://orcid.org/0000-0002-7406-5283 https://orcid.org/0000-0001-8217-8213 en_US http://dx.doi.org/10.1063/1.4795858 Applied Physics Letters Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Institute of Physics (AIP) arXiv |
| spellingShingle | Frenzel, Alex James Lui, Chun Hung Fang, Wenjing Nair, Nityan L. Herring, Patrick Kenichi Jarillo-Herrero, Pablo Kong, Jing Gedik, Nuh Observation of suppressed terahertz absorption in photoexcited graphene |
| title | Observation of suppressed terahertz absorption in photoexcited graphene |
| title_full | Observation of suppressed terahertz absorption in photoexcited graphene |
| title_fullStr | Observation of suppressed terahertz absorption in photoexcited graphene |
| title_full_unstemmed | Observation of suppressed terahertz absorption in photoexcited graphene |
| title_short | Observation of suppressed terahertz absorption in photoexcited graphene |
| title_sort | observation of suppressed terahertz absorption in photoexcited graphene |
| url | http://hdl.handle.net/1721.1/87105 https://orcid.org/0000-0002-3416-3962 https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0003-0551-1208 https://orcid.org/0000-0002-7406-5283 https://orcid.org/0000-0001-8217-8213 |
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