Localized states of two interacting electrons

in vertically coupled quantum dots induced

by a time-dependent electric field

W. Ben Chouikha1*, S. Jaziri2, R. Bennaceur2

1 Département de Physique, Faculté des Sciences de Bizerte, Jarzouna 7021 Bizerte Tunisie

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

* Corresponding author. E-mail : wiem.benchouikha@fst.rnu.tn

Received : 03 May 2002; revised version accepted : 29 January 2003

Abstract

To investigate useful properties of localization caused by an external time dependent electric field on two electrons in a vertically coupled quantum dots, we carry out a numerical analysis of the two electron wave functions including their Coulomb interaction. In the case where the sizes of the dots are different, we present a simple method including two electron states and describing a double occupation of a quantum dot. This model gives us some insight into how the Coulomb interaction and exchange combined with an appropriate time dependent field affect the success of the localization effects of the two electrons states on a fast time scale.

Keywords: Double quantum dot ; Spintronics ; Localization.

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