Dynamics of bright and dark excitons in a self-assembled quantum dot

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

doi:10.1063/1.1994272

Dynamics of bright and dark excitons in a self-assembled quantum dot

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

School of Engineering & Physical Sciences

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We report on a spin-flip process in a charge tunable quantum dot in which a non-radiative dark exciton, with angular momentum L = 2, becomes a radiative bright exciton, L = 1, through interactions with a Fermi sea in an n-doped back contact. This process presents itself by a strongly bias dependent secondary lifetime in radiative lifetime measurements of the neutral exciton. By studying dots with different emission energies the spin-flip process is shown to have a strong dependence on the tunneling rate between the dot and the back contact. An Anderson-like Hamiltonian is used to model a coherent spin swap process between an electron in the dot and electrons in the back contact and gives very good agreement with the experiment. © 2005 American Institute of Physics.

Original language	English
Title of host publication	PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27
Editors	J Menendez, CG VanDeWalle
Place of Publication	MELVILLE
Publisher	American Institute of Physics
Pages	645-646
Number of pages	2
Volume	772
ISBN (Print)	0735402574, 9780735402577
DOIs	https://doi.org/10.1063/1.1994272
Publication status	Published - 30 Jun 2005
Event	27th International Conference on the Physics of Semiconductors - Flagstaff, Arizona, Argentina Duration: 26 Jul 2004 → 30 Jul 2004

Conference

Conference	27th International Conference on the Physics of Semiconductors
Abbreviated title	ICPS-27
Country/Territory	Argentina
City	Flagstaff, Arizona
Period	26/07/04 → 30/07/04

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10.1063/1.1994272

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Dalgarno, P. A., Ediger, M., Smith, J. M., Warburton, R. J., Karrai, K., Govorov, A. O., Gerardot, B. D., & Petroff, P. M. (2005). Dynamics of bright and dark excitons in a self-assembled quantum dot. In J. Menendez, & CG. VanDeWalle (Eds.), PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27 (Vol. 772, pp. 645-646). American Institute of Physics. https://doi.org/10.1063/1.1994272

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title = "Dynamics of bright and dark excitons in a self-assembled quantum dot",

abstract = "We report on a spin-flip process in a charge tunable quantum dot in which a non-radiative dark exciton, with angular momentum L = 2, becomes a radiative bright exciton, L = 1, through interactions with a Fermi sea in an n-doped back contact. This process presents itself by a strongly bias dependent secondary lifetime in radiative lifetime measurements of the neutral exciton. By studying dots with different emission energies the spin-flip process is shown to have a strong dependence on the tunneling rate between the dot and the back contact. An Anderson-like Hamiltonian is used to model a coherent spin swap process between an electron in the dot and electrons in the back contact and gives very good agreement with the experiment. {\textcopyright} 2005 American Institute of Physics.",

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

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publisher = "American Institute of Physics",

address = "United States",

note = "27th International Conference on the Physics of Semiconductors, ICPS-27 ; Conference date: 26-07-2004 Through 30-07-2004",

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Dalgarno, PA, Ediger, M, Smith, JM, Warburton, RJ, Karrai, K, Govorov, AO, Gerardot, BD & Petroff, PM 2005, Dynamics of bright and dark excitons in a self-assembled quantum dot. in J Menendez & CG VanDeWalle (eds), PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27. vol. 772, American Institute of Physics, MELVILLE, pp. 645-646, 27th International Conference on the Physics of Semiconductors, Flagstaff, Arizona, Argentina, 26/07/04. https://doi.org/10.1063/1.1994272

Dynamics of bright and dark excitons in a self-assembled quantum dot. / Dalgarno, Paul A.; Ediger, Matthias; Smith, Jason M. et al.
PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27. ed. / J Menendez; CG VanDeWalle. Vol. 772 MELVILLE: American Institute of Physics, 2005. p. 645-646.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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T1 - Dynamics of bright and dark excitons in a self-assembled quantum dot

AU - Dalgarno, Paul A.

AU - Ediger, Matthias

AU - Smith, Jason M.

AU - Warburton, Richard J.

AU - Karrai, Khaled

AU - Govorov, Alexander O.

AU - Gerardot, Brian D.

AU - Petroff, Pierre M.

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N2 - We report on a spin-flip process in a charge tunable quantum dot in which a non-radiative dark exciton, with angular momentum L = 2, becomes a radiative bright exciton, L = 1, through interactions with a Fermi sea in an n-doped back contact. This process presents itself by a strongly bias dependent secondary lifetime in radiative lifetime measurements of the neutral exciton. By studying dots with different emission energies the spin-flip process is shown to have a strong dependence on the tunneling rate between the dot and the back contact. An Anderson-like Hamiltonian is used to model a coherent spin swap process between an electron in the dot and electrons in the back contact and gives very good agreement with the experiment. © 2005 American Institute of Physics.

AB - We report on a spin-flip process in a charge tunable quantum dot in which a non-radiative dark exciton, with angular momentum L = 2, becomes a radiative bright exciton, L = 1, through interactions with a Fermi sea in an n-doped back contact. This process presents itself by a strongly bias dependent secondary lifetime in radiative lifetime measurements of the neutral exciton. By studying dots with different emission energies the spin-flip process is shown to have a strong dependence on the tunneling rate between the dot and the back contact. An Anderson-like Hamiltonian is used to model a coherent spin swap process between an electron in the dot and electrons in the back contact and gives very good agreement with the experiment. © 2005 American Institute of Physics.

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DO - 10.1063/1.1994272

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EP - 646

BT - PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27

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CY - MELVILLE

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Dalgarno PA, Ediger M, Smith JM, Warburton RJ, Karrai K, Govorov AO et al. Dynamics of bright and dark excitons in a self-assembled quantum dot. In Menendez J, VanDeWalle CG, editors, PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27. Vol. 772. MELVILLE: American Institute of Physics. 2005. p. 645-646 doi: 10.1063/1.1994272

Dynamics of bright and dark excitons in a self-assembled quantum dot

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