ФТТ, 2003, том 45, выпуск 4

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Electrodynamical treatment of the electron-hole long-range exchange interaction in semiconductor nanocrystals

S.V.Goupalov *,**, P.Lavallard ***, G.Lamouche ****, D.S.Citrin *

* School of Electrical and Computer Engineering, Georgia Institute of Technology,
Atlanta, Georgia 30332-0250 USA
** A.F. Ioffe Physico-Technical Institute, Russian Academy of Sciences,
194021 St. Petersburg, Russia
*** Groupe de Physique des Solides, CNRS, UMR 7588,
Universite Denis Diderot and Universite Pierre et Marie Curie,
75251 Paris, Cedex 05, France
**** Institut des Materiaux Industriels, CNRC,
Boucherville, Quebec, Canada J4B-6Y4
E-mail: goupalov@ece.gatech.edu

(Received 12 September 2002)

We show that the contribution to the fine structure of the ground exciton level in a semiconductor nanocrystal due to the long-range part of the electron-hole exchange interaction can be equivalently described as arising from the mechanical exciton interaction with the exciton-induced macroscopic longitudinal electric field. Particular cases of nanocrystals with cubic and wurtzite crystal lattice in the strong confinement regime are studied taking into account the complex structure of the valence band. A simplified model accounting for the exciton ground-level splitting and exploiting an effective local scalar succeptibility is established.

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