Details
| Original language | English |
|---|---|
| Pages (from-to) | 2172-2175 |
| Number of pages | 4 |
| Journal | Physica E: Low-Dimensional Systems and Nanostructures |
| Volume | 40 |
| Issue number | 6 |
| Publication status | Published - 1 Apr 2008 |
Abstract
The optical excitation spectra of single self-organized InAs/AlAs quantum dots reveal transitions to excited states involving quantum dot phonons. Resonant excitation is observed at 31 and 41 meV, corresponding to the "InAs-like" and "AlAs-like" optical phonons of InAlAs with low Al concentration. Polarization-resolved measurements reveal separate resonances at the fine structure split exciton levels. The present results demonstrate that both LO phonons in a mixed quantum dot can contribute to the relaxation of excited states and represent a direct measurement of the intermixing in a single quantum dot.
Keywords
- Phonons, Photoluminescence, Quantum dots
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 40, No. 6, 01.04.2008, p. 2172-2175.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Resonant optical excitation and intermixing in InAs/AlAs single quantum dots
AU - Sarkar, D.
AU - Calleja, J. M.
AU - van der Meulen, H. P.
AU - Meyer, J. M.
AU - Haug, R. J.
AU - Pierz, K.
N1 - Funding information: This work has been supported by research contracts of the Spanish Ministry of Education (MEC MAT2005-01388, NAN2004-09109-C04-04 and Consolider-CSD 2006-19) and the Community of Madrid (CAM S-0505-/ESP-0200).
PY - 2008/4/1
Y1 - 2008/4/1
N2 - The optical excitation spectra of single self-organized InAs/AlAs quantum dots reveal transitions to excited states involving quantum dot phonons. Resonant excitation is observed at 31 and 41 meV, corresponding to the "InAs-like" and "AlAs-like" optical phonons of InAlAs with low Al concentration. Polarization-resolved measurements reveal separate resonances at the fine structure split exciton levels. The present results demonstrate that both LO phonons in a mixed quantum dot can contribute to the relaxation of excited states and represent a direct measurement of the intermixing in a single quantum dot.
AB - The optical excitation spectra of single self-organized InAs/AlAs quantum dots reveal transitions to excited states involving quantum dot phonons. Resonant excitation is observed at 31 and 41 meV, corresponding to the "InAs-like" and "AlAs-like" optical phonons of InAlAs with low Al concentration. Polarization-resolved measurements reveal separate resonances at the fine structure split exciton levels. The present results demonstrate that both LO phonons in a mixed quantum dot can contribute to the relaxation of excited states and represent a direct measurement of the intermixing in a single quantum dot.
KW - Phonons
KW - Photoluminescence
KW - Quantum dots
UR - http://www.scopus.com/inward/record.url?scp=41349118296&partnerID=8YFLogxK
U2 - 10.1016/j.physe.2007.10.076
DO - 10.1016/j.physe.2007.10.076
M3 - Article
AN - SCOPUS:41349118296
VL - 40
SP - 2172
EP - 2175
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
SN - 1386-9477
IS - 6
ER -