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  Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides

Shi, J., Baldini, E., Latini, S., Sato, S., Zhang, Y., Pein, B. C., et al. (2020). Room Temperature Terahertz Electroabsorption Modulation by Excitons in Monolayer Transition Metal Dichalcogenides. Nano Letters, 20(7), 5214-5220. doi:10.1021/acs.nanolett.0c01134.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0006-C9BB-5 Version Permalink: https://hdl.handle.net/21.11116/0000-000B-B4F6-4
Genre: Journal Article

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https://dx.doi.org/10.1021/acs.nanolett.0c01134 (Publisher version)
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https://arxiv.org/abs/2006.04786 (Preprint)
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 Creators:
Shi, J.1, Author
Baldini, E.2, Author
Latini, S.3, 4, Author           
Sato, S.3, 4, 5, Author           
Zhang, Y.1, Author
Pein, B. C.1, Author
Shen, P.-C.6, Author
Kong, J.6, Author
Rubio, A.3, 4, 7, 8, Author           
Gedik, N.2, Author
Nelson, K. A.1, Author
Affiliations:
1Department of Chemistry, Massachusetts Instituteof Technology, Cambridge, ou_persistent22              
2Department of Physics, Massachusetts Institute of Technology, Cambridge, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Center for Free Electron Laser Science, ou_persistent22              
5Center for Computational Sciences, University of Tsukuba, ou_persistent22              
6Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, ou_persistent22              
7Nano-Bio Spectroscopy Group, Departamento de Fisica de Materiales, Universidad del País Vasco, ou_persistent22              
8Center for Computational Quantum Physics, Simons Foundation Flatiron Institute, New York, ou_persistent22              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2020-06-142020-04-082020-06-152020-07-08
 Publication Status: Issued
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.nanolett.0c01134
 Degree: -

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Project name : We acknowledge helpful discussions with J. Yoon, Y. Bie, E. J. Sie, B. Skinner, and P. Sivarajah and technical assistance from T. McClure. This manuscript is based upon work by J.S. and K.A.N. supported in part by the U.S. Army Research Laboratory (ARL) and the U.S. Army Research Office through the Institute for Soldier Nanotechnologies, under Cooperative Agreement number W911-NF-18-2-0048. J.S. and K.A.N. acknowledge additional support from the Samsung Global Outreach Program. E.B. acknowledges additional support from the Swiss National Science Foundation under fellowships P2ELP2-172290 and P400P2-183842. N.G. and E.B. acknowledge support from DOE, BES DMSE. S.L. acknowledges support from the Alexander von Humboldt foundation. S.A.S. acknowledges JST-CREST under Grant No. JP-MJCR16N5. This work was supported by the European Research Council (ERC-2015-AdG694097), the Cluster of Excellence (AIM), Grupos Consolidados (IT1249-19), and SFB925. The Flatiron Institute is a division of the Simons Foundation. P.C.S. and J.K. acknowledge the financial support from the Center for Energy Efficient Electronics Science (NSF Award No. 0939514).
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Source 1

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Title: Nano Letters
  Abbreviation : Nano Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 20 (7) Sequence Number: - Start / End Page: 5214 - 5220 Identifier: ISSN: 1530-6984
CoNE: https://pure.mpg.de/cone/journals/resource/110978984570403