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Screening by composite charged particles: the case of quantum well trions

By Cristiano Ciuti and Gérald Bastard

Abstract

We study the screening of an external potentialproduced by a two-dimensional gas of charged excitons (trions). Wedetermine the contribution to the dielectric function induced bythese composite charged particles within a random phaseapproximation. In mixtures of free electrons and trions, the trionresponse is found dominant. In the long wave-length limit, trionsbehave as point charges with mass equal to the sum of the threeparticle components. For finite wave-vectors, we show how thedielectric response is sensitive to the composite nature of trionsand the internal degrees of freedom. Predictions are presentedfor the screening of a Coulomb potential, the scattering bycharged impurities and the properties of trionic plasmons

Topics: [PHYS.COND.CM-GEN] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
Publisher: Elsevier
Year: 2005
OAI identifier: oai:HAL:hal-00001141v1
Provided by: Hal-Diderot
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