Exciton and negative trion dissociation by an external electric field in vertically coupled quantum dots

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dc.creatorSzafran, B.
dc.creatorChwiej, T.
dc.creatorPeeters, F. M.
dc.creatorBednarek, S.
dc.creatorAdamowski, J.
dc.creatorPartoens, B.
dc.date2005-03-10
dc.date.accessioned2026-07-07T07:51:47Z
dc.date.available2026-07-07T07:51:47Z
dc.descriptionWe study the Stark effect for an exciton confined in a pair of vertically coupled quantum dots. A single-band approximation for the hole and a parabolic lateral confinement potential are adopted which allows for the separation of the lateral center-of-mass motion and consequently for an exact numerical solution of the Schrödinger equation. We show that for intermediate tunnel coupling the external electric field leads to the dissociation of the exciton via an avoided crossing of bright and dark exciton energy levels which results in an atypical form of the Stark shift. The electric-field-induced dissociation of the negative trion is studied using the approximation of frozen lateral degrees of freedom. It is shown that in a symmetric system of coupled dots the trion is more stable against dissociation than the exciton. For an asymmetric system of coupled dots the trion dissociation is accompanied by a positive curvature of the recombination energy line as a function of the electric field.
dc.descriptionPRB - in print
dc.identifierhttps://arxiv.org/abs/cond-mat/0503244
dc.identifierhttp://arxiv.org/abs/cond-mat/0503244
dc.identifierPhys. Rev. B 71, 205316 (2005)
dc.identifierdoi:10.1103/PhysRevB.71.205316
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/125641
dc.subjectMesoscale and Nanoscale Physics
dc.titleExciton and negative trion dissociation by an external electric field in vertically coupled quantum dots
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