Trion-Induced Negative Photoconductivity in Monolayer MoS[subscript 2]
Optical excitation typically enhances electrical conduction and low-frequency radiation absorption in semiconductors. We, however, observe a pronounced transient decrease of conductivity in doped monolayer molybdenum disulfide (MoS[subscript 2]), a two-dimensional (2D) semiconductor, using ultrafast...
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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/1721.1/91027 https://orcid.org/0000-0002-2257-9944 https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0003-0551-1208 https://orcid.org/0000-0002-7406-5283 https://orcid.org/0000-0001-5908-3064 |
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| author | Lee, Y.-H. Ling, X. Akselrod, Gleb Markovitch Lui, Chun Hung Frenzel, Alex James Pilon, Daniel Victor 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 Lee, Y.-H. Ling, X. Akselrod, Gleb Markovitch Lui, Chun Hung Frenzel, Alex James Pilon, Daniel Victor Kong, Jing Gedik, Nuh |
| author_sort | Lee, Y.-H. |
| collection | MIT |
| description | Optical excitation typically enhances electrical conduction and low-frequency radiation absorption in semiconductors. We, however, observe a pronounced transient decrease of conductivity in doped monolayer molybdenum disulfide (MoS[subscript 2]), a two-dimensional (2D) semiconductor, using ultrafast optical-pump terahertz-probe spectroscopy. In particular, the conductivity is reduced to only 30% of its equilibrium value at high pump fluence. This anomalous phenomenon arises from the strong many-body interactions in the 2D system, where photoexcited electron-hole pairs join the doping-induced charges to form trions, bound states of two electrons and one hole. The resultant increase of the carrier effective mass substantially diminishes the conductivity. |
| first_indexed | 2024-09-23T11:02:20Z |
| format | Article |
| id | mit-1721.1/91027 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:02:20Z |
| publishDate | 2014 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/910272022-09-27T16:40:20Z Trion-Induced Negative Photoconductivity in Monolayer MoS[subscript 2] Lee, Y.-H. Ling, X. Akselrod, Gleb Markovitch Lui, Chun Hung Frenzel, Alex James Pilon, Daniel Victor Kong, Jing Gedik, Nuh Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology. Department of Physics Lui, Chun Hung Frenzel, Alex James Pilon, Daniel Victor Lee, Y.-H. Ling, X. Akselrod, Gleb Markovitch Kong, Jing Gedik, Nuh Optical excitation typically enhances electrical conduction and low-frequency radiation absorption in semiconductors. We, however, observe a pronounced transient decrease of conductivity in doped monolayer molybdenum disulfide (MoS[subscript 2]), a two-dimensional (2D) semiconductor, using ultrafast optical-pump terahertz-probe spectroscopy. In particular, the conductivity is reduced to only 30% of its equilibrium value at high pump fluence. This anomalous phenomenon arises from the strong many-body interactions in the 2D system, where photoexcited electron-hole pairs join the doping-induced charges to form trions, bound states of two electrons and one hole. The resultant increase of the carrier effective mass substantially diminishes the conductivity. United States. Dept. of Energy. Office of Basic Energy Sciences (Grant DE-SC0006423) National Science Foundation (U.S.) (Grant NSF DMR 0845358) 2014-10-21T16:00:18Z 2014-10-21T16:00:18Z 2014-10 2014-06 2014-10-16T22:00:03Z Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/91027 Lui, C. H., et al. "Trion-Induced Negative Photoconductivity in Monolayer MoS[subscript 2]." Phys. Rev. Lett. 113, 166801 (October 2014). © 2014 American Physical Society https://orcid.org/0000-0002-2257-9944 https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0003-0551-1208 https://orcid.org/0000-0002-7406-5283 https://orcid.org/0000-0001-5908-3064 en http://dx.doi.org/10.1103/PhysRevLett.113.166801 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 | Lee, Y.-H. Ling, X. Akselrod, Gleb Markovitch Lui, Chun Hung Frenzel, Alex James Pilon, Daniel Victor Kong, Jing Gedik, Nuh Trion-Induced Negative Photoconductivity in Monolayer MoS[subscript 2] |
| title | Trion-Induced Negative Photoconductivity in Monolayer MoS[subscript 2] |
| title_full | Trion-Induced Negative Photoconductivity in Monolayer MoS[subscript 2] |
| title_fullStr | Trion-Induced Negative Photoconductivity in Monolayer MoS[subscript 2] |
| title_full_unstemmed | Trion-Induced Negative Photoconductivity in Monolayer MoS[subscript 2] |
| title_short | Trion-Induced Negative Photoconductivity in Monolayer MoS[subscript 2] |
| title_sort | trion induced negative photoconductivity in monolayer mos subscript 2 |
| url | http://hdl.handle.net/1721.1/91027 https://orcid.org/0000-0002-2257-9944 https://orcid.org/0000-0002-6394-4987 https://orcid.org/0000-0003-0551-1208 https://orcid.org/0000-0002-7406-5283 https://orcid.org/0000-0001-5908-3064 |
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