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APS » Journals » Phys. Rev. B » Volume 63 » Issue 24
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Phys. Rev. B 63, 241303(R) (2001) [4 pages]

Carrier relaxation and quantum decoherence of excited states in self-assembled quantum dots

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H. Htoon1, D. Kulik1, O. Baklenov2, A. L. Holmes, Jr.2,3, T. Takagahara4, and C. K. Shih1,3
1Department of Physics, University of Texas at Austin, Austin, Texas 78712
2Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, Texas 78712
3Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712
4Department of Electronics and Information Science, Kyoto Institute of Technology, Kyoto 606-8585, Japan

Received 5 April 2001; published 4 June 2001

We report systematic measurements of photoluminescence excitation spectra and dephasing times (T2’s) on various excited states of hundreds of individual quantum dots (QDs). From the variation of T2’s with the energy separation between excited states and the ground state (Erel), we identified two distinct regions of Erel where LO phonon emission and hole relaxation via LA phonon emission play as dominat dephasing mechanisms. We also found a clear evidence of significantly slow energy relaxation in the Erel range where these phonon emission processes are suppressed due to the reduction of interaction phase space.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.63.241303
DOI:
10.1103/PhysRevB.63.241303
PACS:
78.66.Fd, 63.22.+m, 71.35.Cc, 78.55.Cr
 
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