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Exciton–phonon interactions and exciton pure dephasing in lens-shaped quantum dots

✍ Scribed by I.V. Bondarev; S.A. Maksimenko; G.Ya. Slepyan; I.L. Krestnikov; A. Hoffmann

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
220 KB
Volume
23
Category
Article
ISSN
0928-4931

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✦ Synopsis

We have investigated exciton -phonon coupling and a zero-phonon exciton absorption line shape for lens-shaped quantum dots (QDs). Such dots occur in quasi-monolayer semiconductor heterostructures due to the interfacial roughness making quasi-2D excitons localize in lens-shaped quantum dot-like islands. The lateral size dependence calculated of low-temperature Huang -Rhys factors indicates the enhancement of exciton -phonon coupling with decreasing the lateral size of the quasi-2D exciton localization area. The low-temperature zero-phonon line exhibits an essentially non-Lorentzian asymmetric shape with the asymmetry increasing with the decrease of temperature and the lateral size of the quasi-2D exciton localization area.

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