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Optical Spectroscopy of Single Self Assembled Quantum Dots

Published online by Cambridge University Press:  10 February 2011

E. Dekel ,
D. Gershoni ,
E. Ehrenfreund ,
J.M. Garcia  and
P.M. Petroff
E. Dekel
Affiliation:
Physics Department and Solid State Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel
D. Gershoni
Affiliation:
Physics Department and Solid State Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel, dg@phvsics.technion.ac.il
E. Ehrenfreund
Affiliation:
Physics Department and Solid State Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel
J.M. Garcia
Affiliation:
Materials Department, University of California, Santa Barbara, California 93106, USA
P.M. Petroff
Affiliation:
Materials Department, University of California, Santa Barbara, California 93106, USA
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Abstract

We applied low temperature diffraction limited confocal optical microscopy to spatially resolve, and spectroscopically study photoluminescence from single self-assembled semiconductor quantum dots. Using selective wavelength imaging we unambiguously demonstrated that a single photoexcited quantum dot emits light in a few very narrow spectral lines. By solving numerically a many body Hamiltonian for a model quantum dot, we show that the multi-line emission spectrum is due to optical transitions between confined exciton multiplexes. We explain the measured spectrum and its dependence on the power of either cw or pulsed excitation by analytically solving the coupled rate equations for the excitation relaxation between these exciton multiplexes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 571: Symposium W – Semiconductor Quantum Dots , 1999 , 135
Copyright
Copyright © Materials Research Society 2000

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