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Título: | Room temperature terahertz electroabsorption modulation by excitons in monolayer transition metal dichalcogenides |
Autor: | Shi, Jiaojian; Baldini, Edoardo; Latini, Simone; Sato, Shunsuke A.; Zhang, Yaqing; Pein, Brandt C.; Shen, Pin-Chun; Kong, Jing; Rubio, Angel CSIC ORCID; Gedik, Nuh; Nelson, Keith A. | Fecha de publicación: | 2020 | Editor: | ACS Publications | Citación: | Nano Letters 20(7): 5214-5220 (2020) | Resumen: | 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. | Descripción: | arXiv:2006.04786v1 | Versión del editor: | https://doi.org/10.1021/acs.nanolett.0c01134 | URI: | http://hdl.handle.net/10261/235542 | DOI: | 10.1021/acs.nanolett.0c01134 | E-ISSN: | 1530-6992 |
Aparece en las colecciones: | (CFM) Artículos |
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