Probing biexciton in monolayer WS2through controlled many-body interaction

Chatterjee, S and Das, S and Gupta, G and Watanabe, K and Taniguchi, T and Majumdar, K (2022) Probing biexciton in monolayer WS2through controlled many-body interaction. In: 2D Materials, 9 (1).

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Abstract

The monolayers of semiconducting transition metal dichalcogenides host strongly bound excitonic complexes and are an excellent platform for exploring many-body physics. Here we demonstrate a controlled kinetic manipulation of the five-particle excitonic complex, the charged biexciton, through a systematic dependence of the biexciton peak on excitation power, gate voltage, and temperature using steady-state and time-resolved photoluminescence. With the help of a combination of the experimental data and a rate equation model, we argue that the binding energy of the charged biexciton is less than the spectral separation of its peak from the neutral exciton. We also note that while the momentum-direct radiative recombination of the neutral exciton is restricted within the light cone, such restriction is relaxed for a charged biexciton recombination due to the presence of near-parallel excited and final states in the momentum space. © 2021 IOP Publishing Ltd.

Item Type:	Journal Article
Publication:	2D Materials
Publisher:	IOP Publishing Ltd
Additional Information:	The copyright for this article belongs to IOP Publishing Ltd
Keywords:	Binding energy; Excited states; Monolayers; Semiconductor quantum wells; Transition metals, Biexciton kinetic; Biexcitons; Dichalcogenides; Excitonic complexes; Light-cone; Many-body interactions; Neutral excitons; Semiconducting transition; TMDC; TRPL, Excitons
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	24 Jan 2022 10:41
Last Modified:	24 Jan 2022 10:41
URI:	http://eprints.iisc.ac.in/id/eprint/71025

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