Ultrafast carrier dynamics in size-controlled, self-assembled, InGaAs/GaAs quantum dots

L. Zhang; T.F. Boggess; K. Gundogdu; M.E. Flatte; D.G. Deppe; D.L. Huffaker; O.B. Shchekin; C. Cao

doi:10.1109/CLEO.2001.947909

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Conference proceeding

Ultrafast carrier dynamics in size-controlled, self-assembled, InGaAs/GaAs quantum dots

L. Zhang, T.F. Boggess, K. Gundogdu, M.E. Flatte, D.G. Deppe, D.L. Huffaker, O.B. Shchekin and C. Cao

Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH37170), pp.357-358

2001

DOI: 10.1109/CLEO.2001.947909

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Abstract

Summary form only given. We describe measurements of carrier energy relaxation in a set of InGaAs/GaAs with various sizes resulting in energy level spacing (/spl Delta/E) ranging from /spl sim/65 meV to /spl sim/95 meV. We demonstrate that in all cases the relaxation is extremely rapid but slows with increasing /spl Delta/E. This behavior is highly suggestive of relaxation through phonon emission. Optical phonon energies of 29.6, 32.6, and 37.6 meV have been reported previously in InAs/GaAs self-assembled QDs. Thus, depending on the relative distribution of energy among the electron and hole levels, relaxation through single phonon emission (for both electrons and holes) is possible for /spl Delta/E /spl sim/65 meV, but multiphonon emission is required for /spl Delta/E /spl sim/95 meV. Phonon participation in the relaxation is also suggested by the temperature dependence of the measured relaxation rates and by measurements of the excited-state dynamics.

Charge carrier processes

Electron emission

Energy measurement

Energy states

Gallium arsenide

Indium gallium arsenide

Particle measurements

Phonons

Size measurement

Ultraviolet sources

Details

Title: Subtitle: Ultrafast carrier dynamics in size-controlled, self-assembled, InGaAs/GaAs quantum dots
Creators: L. Zhang - Dept. of Phys. & Astron., Iowa Univ., Iowa City, IA, USA
T.F. Boggess - University of Iowa
K. Gundogdu - University of Iowa
M.E. Flatte - University of Iowa
D.G. Deppe - University of Iowa
D.L. Huffaker - University of Iowa
O.B. Shchekin - University of Iowa
C. Cao - University of Iowa
Resource Type: Conference proceeding
Publication Details: Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH37170), pp.357-358
Publisher: IEEE
DOI: 10.1109/CLEO.2001.947909
Language: English
Date published: 2001
Academic Unit: Electrical and Computer Engineering; Physics and Astronomy
Record Identifier: 9984429021202771

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