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Effect of size confinement in C exciton dynamics of few-layered MoS2 nano-sheets
Author(s): Manobina Karmakar; Sayantan Bhattacharya; Subhrajit Mukherjee; Rup Kumar Chowdhury; Samit K. Ray; Prasanta Kumar Datta
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Paper Abstract

We study transient absorption response of few-layered MoS2 nano-flakes in dispersion, mainly focusing on its high energy exciton (commonly known as C exciton). We use a simple sono-chemical exfoliation technique to obtain confined nano-crystals of MoS2 of average diameter 2 nm, inter-dispersed in the flakes and study the effect of quantum confinement on this layered semiconductor. We emphasize on the interplay between exciton bleaching and excited state absorption upon a blue-detuned pumping. The relaxation times for the exciton are found and for the nano-crystals the radiative relaxation process is found to be slower as compared to that of the nano-flakes.

Paper Details

Date Published: 21 May 2018
PDF: 7 pages
Proc. SPIE 10673, Advances in Ultrafast Condensed Phase Physics, 1067307 (21 May 2018); doi: 10.1117/12.2307491
Show Author Affiliations
Manobina Karmakar, Indian Institute of Technology Kharagpur (India)
Sayantan Bhattacharya, Indian Institute of Technology Kharagpur (India)
Subhrajit Mukherjee, Indian Institute of Technology Kharagpur (India)
Rup Kumar Chowdhury, Indian Institute of Technology Kharagpur (India)
Samit K. Ray, Indian Institute of Technology Kharagpur (India)
S.N. Bose National Ctr. for Basic Sciences (India)
Prasanta Kumar Datta, Indian Institute of Technology Kharagpur (India)


Published in SPIE Proceedings Vol. 10673:
Advances in Ultrafast Condensed Phase Physics
Martin Schultze; Eleftherios Goulielmakis; Thomas Brabec, Editor(s)

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