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Resonant optical excitation of longitudinal-optical phonons and intermixing in InAsAlAs single quantum dots

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Authors

  • D. Sarkar
  • H. P. Van Der Meulen
  • J. M. Calleja
  • J. M. Meyer
  • R. J. Haug

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External Research Organisations

  • Universidad Autónoma de Madrid
  • Physikalisch-Technische Bundesanstalt PTB
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Details

Original languageEnglish
Article number181909
JournalApplied physics letters
Volume92
Issue number18
Publication statusPublished - 16 May 2008

Abstract

Excitations of a single InAsAlAs self-assembled quantum dot were investigated by photoluminescence excitation spectroscopy. Resonant absorption by longitudinal-optical (LO) phonons of the quantum dot and the barriers is observed. In particular, a resonance at 41 meV is attributed to the AlAs-like mode of InAlAs with low Al content. Our results represent a direct optical measure of the intermixing (estimated below 10%) in a single quantum dot. They also demonstrate that all LO phonons of this mixed quantum dot system couple to the exciton states.

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Cite this

Resonant optical excitation of longitudinal-optical phonons and intermixing in InAsAlAs single quantum dots. / Sarkar, D.; Van Der Meulen, H. P.; Calleja, J. M. et al.
In: Applied physics letters, Vol. 92, No. 18, 181909, 16.05.2008.

Research output: Contribution to journal › Article › Research › peer review

Sarkar D, Van Der Meulen HP, Calleja JM, Meyer JM, Haug RJ, Pierz K. Resonant optical excitation of longitudinal-optical phonons and intermixing in InAsAlAs single quantum dots. Applied physics letters. 2008 May 16;92(18):181909. doi: 10.1063/1.2920441
Sarkar, D. ; Van Der Meulen, H. P. ; Calleja, J. M. et al. / Resonant optical excitation of longitudinal-optical phonons and intermixing in InAsAlAs single quantum dots. In: Applied physics letters. 2008 ; Vol. 92, No. 18.
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abstract = "Excitations of a single InAsAlAs self-assembled quantum dot were investigated by photoluminescence excitation spectroscopy. Resonant absorption by longitudinal-optical (LO) phonons of the quantum dot and the barriers is observed. In particular, a resonance at 41 meV is attributed to the AlAs-like mode of InAlAs with low Al content. Our results represent a direct optical measure of the intermixing (estimated below 10%) in a single quantum dot. They also demonstrate that all LO phonons of this mixed quantum dot system couple to the exciton states.",
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AU - Sarkar, D.

AU - Van Der Meulen, H. P.

AU - Calleja, J. M.

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, TEC2004-05260-C02-02, Consolider CSD 2006-19) and the Community of Madrid (CAM S-0505-ESP-0200).

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