Coherent optical response driven by non-equilibrium electron–phonon dynamics in a layered transition-metal dichalcogenide

Layered transition-metal dichalcogenides (TMDs) are model systems to explore ultrafast many-body interactions and various nonlinear optical phenomena. For the application of TMD-based optoelectronic devices capable of ultrafast response, it is essential to understand how characteristic electron–hole...

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Bibliographic Details
Published in:APL materials 2024-02, Vol.12 (2), p.021102-021102-11
Main Authors: Fukuda, Takumi, Makino, Kotaro, Saito, Yuta, Fons, Paul, Ando, Atsushi, Mori, Takuya, Ishikawa, Ryo, Ueno, Keiji, Afalla, Jessica, Hase, Muneaki
Format: Article
Language:English
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Summary:Layered transition-metal dichalcogenides (TMDs) are model systems to explore ultrafast many-body interactions and various nonlinear optical phenomena. For the application of TMD-based optoelectronic devices capable of ultrafast response, it is essential to understand how characteristic electron–hole and electron–phonon couplings modify ultrafast electronic and optical properties under photoexcitation. Here, we investigate the sub-picosecond optical responses of layered semiconductor 2H–MoTe2 in the presence of an electron–hole (e–h) plasma and a long-lived coherent phonon. Transient reflectivity measurements depending on photon energy reveal that the optical response for short-time delays (
ISSN:2166-532X
2166-532X
DOI:10.1063/5.0188537