Interaction between excitons determines the non-linear response of nanocrystals

Salvador, Mayrose R.; Nair, P. Sreekumarl; Cho, Minhaeng; Scholes, Gregory D.

doi:10.1016/j.chemphys.2007.12.020

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Interaction between excitons determines the non-linear response of nanocrystals

Salvador, Mayrose R.;
Nair, P. Sreekumarl;
Cho, Minhaeng;
Scholes, Gregory D.

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18

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16

초록

The non-linear response of semiconductor quantum dots is investigated using three-pulse photon echo peak shift (3PEPS) experiments and simulations. The third-order non-linear response is modeled by a three-level system, utilizing Brownian oscillators to model the line-broadening functions. Our results show that biexciton formation and exciton-exciton scattering significantly influence the non-linear response of quantum dots. The exciton to biexciton excited state absorption pathways are also investigated for quantum dots with different crystal structures. Our calculations suggest that the probability of excited state absorption to the biexcitonic state is higher for zinc-blende structured nanocrystals. (C) 2007 Elsevier B.V. All rights reserved.

키워드

nanocrystal; quantum dot; photo echo; non-linear response; laser; ultrafast; CdSe; PUMP-PROBE SPECTROSCOPY; QUANTUM DOTS; TEMPERATURE-DEPENDENCE; OPTICAL GAIN; PHOTON-ECHO; ELECTRONIC EXCITATIONS; CDSE NANOCRYSTALS; STATE DYNAMICS; PAIR STATES; BIEXCITONS

제목: Interaction between excitons determines the non-linear response of nanocrystals

저자: Salvador, Mayrose R.; Nair, P. Sreekumarl; Cho, Minhaeng; Scholes, Gregory D.

DOI: 10.1016/j.chemphys.2007.12.020

발행일: 2008-06-23

유형: Article; Proceedings Paper

저널명: Chemical Physics

권: 350

호: 1-3

페이지: 56 ~ 68