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- W4309654408 abstract "Colloidal CdSe nanoplatelets (NPLs) are unique systems to study two-dimensional excitons and excitonic complexes. However, while absorption and emission of photons through exciton formation and recombination have been extensively quantified, few studies have addressed the exciton-biexciton transition. Here, we use cross-polarized pump-probe spectroscopy to measure the absorption coefficient spectrum of this transition and determine the biexciton oscillator strength (fBX). We show that fBX is independent of the NPL area and that the concomitant biexciton area (SBX) agrees with predictions of a short-range interaction model. Moreover, we show that fBX is comparable to the oscillator strength of forming localized excitons at room temperature while being unaffected itself by center-of-mass localization. These results confirm the relevance of biexcitons for light-matter interaction in NPLs. Moreover, the quantification of the exciton-biexciton transition introduced here will enable researchers to rank 2D materials by the strength of this transition and to compare experimental results with theoretical predictions." @default.
- W4309654408 created "2022-11-29" @default.
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- W4309654408 date "2022-11-21" @default.
- W4309654408 modified "2023-10-17" @default.
- W4309654408 title "Area-Independence of the Biexciton Oscillator Strength in CdSe Colloidal Nanoplatelets" @default.
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- W4309654408 doi "https://doi.org/10.1021/acs.nanolett.2c03683" @default.
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