Interaction between excitons determines the non-linear response of nanocrystals

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

doi:10.1016/j.chemphys.2007.12.020

Interaction between excitons determines the non-linear response of nanocrystals

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

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	56-68
Number of pages	13
Journal	Chemical Physics
Volume	350
Issue number	1-3
DOIs	https://doi.org/10.1016/j.chemphys.2007.12.020
State	Published - Jun 23 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy
Physical and Theoretical Chemistry

Keywords

CdSe
Laser
Nanocrystal
Non-linear response
Photo echo
Quantum dot
Ultrafast

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10.1016/j.chemphys.2007.12.020

Cite this

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title = "Interaction between excitons determines the non-linear response of nanocrystals",

abstract = "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.",

keywords = "CdSe, Laser, Nanocrystal, Non-linear response, Photo echo, Quantum dot, Ultrafast",

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journal = "Chemical Physics",

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T1 - Interaction between excitons determines the non-linear response of nanocrystals

AU - Salvador, Mayrose R.

AU - Sreekumari Nair, P.

AU - Cho, Minhaeng

AU - Scholes, Gregory D.

PY - 2008/6/23

Y1 - 2008/6/23

N2 - 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.

AB - 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.

KW - CdSe

KW - Laser

KW - Nanocrystal

KW - Non-linear response

KW - Photo echo

KW - Quantum dot

KW - Ultrafast

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DO - 10.1016/j.chemphys.2007.12.020

M3 - Article

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SP - 56

EP - 68

JO - Chemical Physics

JF - Chemical Physics

IS - 1-3

ER -

Interaction between excitons determines the non-linear response of nanocrystals

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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