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Dark exciton decay dynamics of a semiconductor quantum dot
Author(s) -
Dalgarno Paul A.,
Smith Jason M.,
Gerardot Brian D.,
Govorov Alexander O.,
Karrai Khaled,
Petroff Pierre M.,
Warburton Richard J.
Publication year - 2005
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200562029
Subject(s) - exciton , trion , biexciton , quantum dot , physics , spin (aerodynamics) , fermi's golden rule , condensed matter physics , exponential decay , excitation , atomic physics , spin flip , semiconductor , fermi gamma ray space telescope , quantum mechanics , scattering , thermodynamics
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, Weinheim)