Semiconducting-to-Metallic Photoconductivity Crossover and Temperature-Dependent Drude Weight in Graphene
We investigate the transient photoconductivity of graphene at various gate-tuned carrier densities by optical-pump terahertz-probe spectroscopy. We demonstrate that graphene exhibits semiconducting positive photoconductivity near zero carrier density, which crosses over to metallic negative photocon...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2014
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| Online Access: | http://hdl.handle.net/1721.1/88651 https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0003-0551-1208 https://orcid.org/0000-0002-7406-5283 |
| _version_ | 1826198675132514304 |
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| author | Frenzel, Alex James Lui, Chun Hung Shin, Yong Cheol 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 Shin, Yong Cheol Kong, Jing Gedik, Nuh |
| author_sort | Frenzel, Alex James |
| collection | MIT |
| description | We investigate the transient photoconductivity of graphene at various gate-tuned carrier densities by optical-pump terahertz-probe spectroscopy. We demonstrate that graphene exhibits semiconducting positive photoconductivity near zero carrier density, which crosses over to metallic negative photoconductivity at high carrier density. These observations can be accounted for by the interplay between photoinduced changes of both the Drude weight and carrier scattering rate. Our findings provide a complete picture to explain the opposite photoconductivity behavior reported in (undoped) graphene grown epitaxially and (doped) graphene grown by chemical vapor deposition. Notably, we observe nonmonotonic fluence dependence of the photoconductivity at low carrier density. This behavior reveals the nonmonotonic temperature dependence of the Drude weight in graphene, a unique property of two-dimensional massless Dirac fermions. |
| first_indexed | 2024-09-23T11:08:23Z |
| format | Article |
| id | mit-1721.1/88651 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:08:23Z |
| publishDate | 2014 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/886512022-09-27T17:22:45Z Semiconducting-to-Metallic Photoconductivity Crossover and Temperature-Dependent Drude Weight in Graphene Frenzel, Alex James Lui, Chun Hung Shin, Yong Cheol Kong, Jing Gedik, Nuh Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology. Department of Materials Science and Engineering Massachusetts Institute of Technology. Department of Physics Frenzel, Alex James Lui, Chun Hung Shin, Yong Cheol Kong, Jing Gedik, Nuh We investigate the transient photoconductivity of graphene at various gate-tuned carrier densities by optical-pump terahertz-probe spectroscopy. We demonstrate that graphene exhibits semiconducting positive photoconductivity near zero carrier density, which crosses over to metallic negative photoconductivity at high carrier density. These observations can be accounted for by the interplay between photoinduced changes of both the Drude weight and carrier scattering rate. Our findings provide a complete picture to explain the opposite photoconductivity behavior reported in (undoped) graphene grown epitaxially and (doped) graphene grown by chemical vapor deposition. Notably, we observe nonmonotonic fluence dependence of the photoconductivity at low carrier density. This behavior reveals the nonmonotonic temperature dependence of the Drude weight in graphene, a unique property of two-dimensional massless Dirac fermions. United States. Dept. of Energy. Office of Basic Energy Sciences (Grant DE-SC0006423) National Science Foundation (U.S.) (Grant DMR-1231319) National Science Foundation (U.S.). Graduate Research Fellowship Program 2014-08-11T13:37:21Z 2014-08-11T13:37:21Z 2014-07 2014-03 2014-07-31T22:00:02Z Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/88651 Frenzel, A. J., C. H. Lui, Y. C. Shin, J. Kong, and N. Gedik. "Semiconducting-to-Metallic Photoconductivity Crossover and Temperature-Dependent Drude Weight in Graphene." Phys. Rev. Lett. 113, 056602 (July 2014). © 2014 American Physical Society https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0003-0551-1208 https://orcid.org/0000-0002-7406-5283 en http://dx.doi.org/10.1103/PhysRevLett.113.056602 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. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Frenzel, Alex James Lui, Chun Hung Shin, Yong Cheol Kong, Jing Gedik, Nuh Semiconducting-to-Metallic Photoconductivity Crossover and Temperature-Dependent Drude Weight in Graphene |
| title | Semiconducting-to-Metallic Photoconductivity Crossover and Temperature-Dependent Drude Weight in Graphene |
| title_full | Semiconducting-to-Metallic Photoconductivity Crossover and Temperature-Dependent Drude Weight in Graphene |
| title_fullStr | Semiconducting-to-Metallic Photoconductivity Crossover and Temperature-Dependent Drude Weight in Graphene |
| title_full_unstemmed | Semiconducting-to-Metallic Photoconductivity Crossover and Temperature-Dependent Drude Weight in Graphene |
| title_short | Semiconducting-to-Metallic Photoconductivity Crossover and Temperature-Dependent Drude Weight in Graphene |
| title_sort | semiconducting to metallic photoconductivity crossover and temperature dependent drude weight in graphene |
| url | http://hdl.handle.net/1721.1/88651 https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0003-0551-1208 https://orcid.org/0000-0002-7406-5283 |
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