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Enhancement and optical control of ultrafast THz conductivity in MoSe2MoS2 vertical heterostructure

Abstract : THz conductivity of large area MoS2 and MoSe2 monolayers as well as their vertical heterostructure, MoSe2MoS2 is measured in the 0.3-5 THz frequency range. Compared to the monolayers, the ultrafast THz reflectivity of the MoSe2MoS2 heterobilayer is enhanced many folds when optically excited above the direct band gap energies of the constituting monolayers. The free carriers generated in the heterobilayer evolve with the characteristic times found in each of the two monolayers. Surprisingly, the same enhancement is recorded in the ultrafst THz reflectivity of the heterobilayer when excited below the MoS2 bandgap energy. A mechanism accounting for these observations is proposed.
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https://hal.archives-ouvertes.fr/hal-03095040
Contributor : Eric Freysz <>
Submitted on : Monday, January 4, 2021 - 3:09:19 PM
Last modification on : Friday, January 8, 2021 - 3:27:23 AM

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Joon Seok, Hee Young, Sunil Kumar, Arvind Singh, Anand Nivedan, et al.. Enhancement and optical control of ultrafast THz conductivity in MoSe2MoS2 vertical heterostructure. Optics Express, Optical Society of America - OSA Publishing, In press, ⟨10.1364/OE.412548⟩. ⟨hal-03095040⟩

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