Piezoelectric exciton acoustic-phonon coupling in single quantum dots

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Sarkar, D.; Van Der Meulen, H.P.; Calleja, J.M.; Meyer, J.M.; Haug, R.J.; Pierz, K.: Piezoelectric exciton acoustic-phonon coupling in single quantum dots. In: Physical Review B 78 (2008), Nr. 24, 241305. DOI: https://doi.org/10.1103/PhysRevB.78.241305

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Abstract: 
Microphotoluminescence spectroscopy at variable temperature, excitation intensity, and energy was performed on a single InAs/AlAs self-assembled quantum dot. The exciton emission line [zero-phonon line (ZPL)] exhibits a broad sideband due to exciton acoustic-phonon coupling by the deformation-potential mechanism. Additionally, narrow low-energy sidebands at about 0.25 meV of the ZPL are attributed to exciton acoustic-phonon piezoelectric coupling. In lowering the excitation energy or intensity these bands gradually dominate the emission spectrum of the quantum dot while the ZPL disappears. At high excitation intensity the sidebands due to piezoelectric coupling decrease strongly and the ZPL dominates the spectrum as a consequence of screening of the piezoelectric coupling by the photocreated free carriers. © 2008 The American Physical Society.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: article
Publishing status: publishedVersion
Issue Date: 2008
Appears in Collections:Fakultät für Mathematik und Physik

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1 image of flag of Germany Germany 54 62.79%
2 image of flag of China China 9 10.47%
3 image of flag of United States United States 8 9.30%
4 image of flag of No geo information available No geo information available 3 3.49%
5 image of flag of Korea, Republic of Korea, Republic of 2 2.33%
6 image of flag of Tunisia Tunisia 1 1.16%
7 image of flag of Russian Federation Russian Federation 1 1.16%
8 image of flag of Romania Romania 1 1.16%
9 image of flag of Japan Japan 1 1.16%
10 image of flag of Argentina Argentina 1 1.16%
    other countries 5 5.81%

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