Dark exciton decay dynamics of a semiconductor quantum dot

Paul A. Dalgarno; Jason M. Smith; Brian D. Gerardot; Alexander O. Govorov; Khaled Karrai; Pierre M. Petroff; Richard J. Warburton

doi:10.1002/pssa.200562029

Dark exciton decay dynamics of a semiconductor quantum dot

Paul A. Dalgarno, Jason M. Smith, Brian D. Gerardot, Alexander O. Govorov, Khaled Karrai, Pierre M. Petroff, Richard J. Warburton

School of Engineering & Physical Sciences

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

24 Citations (Scopus)

Abstract

We report measurements of the exciton decay dynamics of a single self-assembled quantum dot following non-resonant excitation. The singly charged exciton, the trion, exhibits a simple one component exponential decay corresponding to radiative recombination. Conversely, the neutral exciton exhibits a two component exponential decay. We argue that the secondary component arises from dark exciton creation and subsequent conversion to a bright exciton through a spin flip. The spin flip time is a strong function of the bias applied between a Fermi reservoir close to the dot and a Schottky gate electrode as a result of a Kondo-like spin swap process. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA,.

Original language	English
Pages (from-to)	2591-2597
Number of pages	7
Journal	Physica Status Solidi (A) Applications and Materials Science
Volume	202
Issue number	14
DOIs	https://doi.org/10.1002/pssa.200562029
Publication status	Published - Nov 2005

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title = "Dark exciton decay dynamics of a semiconductor quantum dot",

abstract = "We report measurements of the exciton decay dynamics of a single self-assembled quantum dot following non-resonant excitation. The singly charged exciton, the trion, exhibits a simple one component exponential decay corresponding to radiative recombination. Conversely, the neutral exciton exhibits a two component exponential decay. We argue that the secondary component arises from dark exciton creation and subsequent conversion to a bright exciton through a spin flip. The spin flip time is a strong function of the bias applied between a Fermi reservoir close to the dot and a Schottky gate electrode as a result of a Kondo-like spin swap process. {\textcopyright} 2005 WILEY-VCH Verlag GmbH & Co. KGaA,.",

author = "Dalgarno, {Paul A.} and Smith, {Jason M.} and Gerardot, {Brian D.} and Govorov, {Alexander O.} and Khaled Karrai and Petroff, {Pierre M.} and Warburton, {Richard J.}",

year = "2005",

month = nov,

doi = "10.1002/pssa.200562029",

language = "English",

volume = "202",

pages = "2591--2597",

journal = "Physica Status Solidi (A) Applications and Materials Science",

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publisher = "Wiley-VCH Verlag",

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TY - JOUR

T1 - Dark exciton decay dynamics of a semiconductor quantum dot

AU - Dalgarno, Paul A.

AU - Smith, Jason M.

AU - Gerardot, Brian D.

AU - Govorov, Alexander O.

AU - Karrai, Khaled

AU - Petroff, Pierre M.

AU - Warburton, Richard J.

PY - 2005/11

Y1 - 2005/11

N2 - We report measurements of the exciton decay dynamics of a single self-assembled quantum dot following non-resonant excitation. The singly charged exciton, the trion, exhibits a simple one component exponential decay corresponding to radiative recombination. Conversely, the neutral exciton exhibits a two component exponential decay. We argue that the secondary component arises from dark exciton creation and subsequent conversion to a bright exciton through a spin flip. The spin flip time is a strong function of the bias applied between a Fermi reservoir close to the dot and a Schottky gate electrode as a result of a Kondo-like spin swap process. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA,.

AB - We report measurements of the exciton decay dynamics of a single self-assembled quantum dot following non-resonant excitation. The singly charged exciton, the trion, exhibits a simple one component exponential decay corresponding to radiative recombination. Conversely, the neutral exciton exhibits a two component exponential decay. We argue that the secondary component arises from dark exciton creation and subsequent conversion to a bright exciton through a spin flip. The spin flip time is a strong function of the bias applied between a Fermi reservoir close to the dot and a Schottky gate electrode as a result of a Kondo-like spin swap process. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA,.

U2 - 10.1002/pssa.200562029

DO - 10.1002/pssa.200562029

M3 - Article

SN - 1862-6300

VL - 202

SP - 2591

EP - 2597

JO - Physica Status Solidi (A) Applications and Materials Science

JF - Physica Status Solidi (A) Applications and Materials Science

IS - 14

ER -

Dark exciton decay dynamics of a semiconductor quantum dot

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