Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides
Copyright © 2020 American Chemical Society. The interaction between off-resonant laser pulses and excitons in monolayer transition metal dichalcogenides is attracting increasing interest as a route for the valley-selective coherent control of the exciton properties. Here, we extend the classificatio...
| Main Authors: | , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Chemical Society (ACS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/132535.2 |
| _version_ | 1810973511061078016 |
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| author | Shi, Jiaojian Baldini, Edoardo Latini, Simone Sato, Shunsuke A. Zhang, Yaqing Pein, Brandt C Shen, Pin-Chun Kong, Jing Rubio, Angel Gedik, Nuh Nelson, Keith Adam |
| author2 | Massachusetts Institute of Technology. Department of Chemistry |
| author_facet | Massachusetts Institute of Technology. Department of Chemistry Shi, Jiaojian Baldini, Edoardo Latini, Simone Sato, Shunsuke A. Zhang, Yaqing Pein, Brandt C Shen, Pin-Chun Kong, Jing Rubio, Angel Gedik, Nuh Nelson, Keith Adam |
| author_sort | Shi, Jiaojian |
| collection | MIT |
| description | Copyright © 2020 American Chemical Society. The interaction between off-resonant laser pulses and excitons in monolayer transition metal dichalcogenides is attracting increasing interest as a route for the valley-selective coherent control of the exciton properties. Here, we extend the classification of the known off-resonant phenomena by unveiling the impact of a strong THz field on the excitonic resonances of monolayer MoS2. We observe that the THz pump pulse causes a selective modification of the coherence lifetime of the excitons, while keeping their oscillator strength and peak energy unchanged. We rationalize these results theoretically by invoking a hitherto unobserved manifestation of the Franz-Keldysh effect on an exciton resonance. As the modulation depth of the optical absorption reaches values as large as 0.05 dB/nm at room temperature, our findings open the way to the use of semiconducting transition metal dichalcogenides as compact and efficient platforms for high-speed electroabsorption devices. |
| first_indexed | 2024-09-23T08:08:45Z |
| format | Article |
| id | mit-1721.1/132535.2 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:08:45Z |
| publishDate | 2022 |
| publisher | American Chemical Society (ACS) |
| record_format | dspace |
| spelling | mit-1721.1/132535.22022-07-20T16:02:49Z Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides Shi, Jiaojian Baldini, Edoardo Latini, Simone Sato, Shunsuke A. Zhang, Yaqing Pein, Brandt C Shen, Pin-Chun Kong, Jing Rubio, Angel Gedik, Nuh Nelson, Keith Adam Massachusetts Institute of Technology. Department of Chemistry Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science MIT Materials Research Laboratory Copyright © 2020 American Chemical Society. The interaction between off-resonant laser pulses and excitons in monolayer transition metal dichalcogenides is attracting increasing interest as a route for the valley-selective coherent control of the exciton properties. Here, we extend the classification of the known off-resonant phenomena by unveiling the impact of a strong THz field on the excitonic resonances of monolayer MoS2. We observe that the THz pump pulse causes a selective modification of the coherence lifetime of the excitons, while keeping their oscillator strength and peak energy unchanged. We rationalize these results theoretically by invoking a hitherto unobserved manifestation of the Franz-Keldysh effect on an exciton resonance. As the modulation depth of the optical absorption reaches values as large as 0.05 dB/nm at room temperature, our findings open the way to the use of semiconducting transition metal dichalcogenides as compact and efficient platforms for high-speed electroabsorption devices. 2022-07-20T16:02:48Z 2021-09-20T18:22:54Z 2022-07-20T16:02:48Z 2020 2020-11-16T15:36:30Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/132535.2 en 10.1021/ACS.NANOLETT.0C01134 Nano Letters Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/octet-stream American Chemical Society (ACS) arXiv |
| spellingShingle | Shi, Jiaojian Baldini, Edoardo Latini, Simone Sato, Shunsuke A. Zhang, Yaqing Pein, Brandt C Shen, Pin-Chun Kong, Jing Rubio, Angel Gedik, Nuh Nelson, Keith Adam Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides |
| title | Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides |
| title_full | Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides |
| title_fullStr | Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides |
| title_full_unstemmed | Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides |
| title_short | Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides |
| title_sort | room temperature terahertz electroabsorption modulation by excitons in monolayer transition metal dichalcogenides |
| url | https://hdl.handle.net/1721.1/132535.2 |
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