Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides
Name
2006.04786.pdf
Description
Submitted version
Size
4.29 MB
Format
Unknown
Checksum (MD5)
b070923e99d646d5dd893fcf6f1335f2
Author(s)
Shi, Jiaojian
Baldini, Edoardo
Latini, Simone
Sato, Shunsuke A.
Zhang, Yaqing
Pein, Brandt C
Shen, Pin-Chun
Kong, Jing
Rubio, Angel
Gedik, Nuh
Date Issued
2020
Journal
Nano Letters
Publisher
American Chemical Society (ACS)
Version
Original manuscript
Abstract
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.
MIT Department
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
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1021/ACS.NANOLETT.0C01134
