https://doi.org/10.1140/epjb/e2014-50305-0
Regular Article
Exciton related optical absorption in a spherical quantum dot
1 Department of Physics, Yeditepe
University, Kayısdagı,
Atasehir, 34755
Istanbul,
Turkey
2 Department of Physics, Middle East
Technical University, 06531
Ankara,
Turkey
a e-mail: vunal@yeditepe.edu.tr
Received:
12
May
2014
Received in final form:
30
September
2014
Published online:
10
November
2014
An exciton in a spherical quantum dot is studied analytically within the effective mass approximation. A parabolic confinement under an electric field is considered. The linear and nonlinear optical absorption coefficients are calculated within the density matrix formalism. No assumptions are made about the strength of the confinement. It is shown how the competing mechanisms of the Coulomb interaction, the confinement and the applied static electric field affect the optical absorption.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2014