Exchange splitting

of excitonic artificial atom in double quantum dot

A. Hichri1, S. Jaziri2*

1 Laboratoire de Physique de la Matière Condensée, Faculté des Sciences de Tunis, Tunisie

2 Département de Physique, Faculté des Sciences de Bizerte, 7021 Zarzouna, Bizerte, Tunisie

* Corresponding author. E-mail : sihem.jaziri@fsb.rnu.tn

Received : 03 May 2002; revised version accepted : 30 January 2003

Abstract

We study the electronic properties of artificial atom composed of a single heavy exciton confined in a large vertically coupled quantum dot. The shape of the dots is approximated to be cylindrically symmetric, and the magnetic field is applied along the symmetry axis. We use harmonic potentials to model the confining of electrons and holes and calculate the exciton’s energy spectrum using the Hund-Mulliken approach, and including the Coulomb interaction. Since, we have calculated the exchange splitting of the ground-state exciton level as a function of the inter-dot distance and magnetic field. The magnetization of the single exciton double quantum dot, is investigated theoretically and is also calculated.

Keywords : Quantum dots ; Exciton ; Exchange energy.

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