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Article Dans Une Revue Solid State Communications Année : 2005

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

Cristiano Ciuti
Gérald Bastard
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Résumé

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.
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Dates et versions

hal-00001141 , version 1 (13-02-2004)

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Cristiano Ciuti, Gérald Bastard. Screening by composite charged particles: the case of quantum well trions. Solid State Communications, 2005, 133, pp.537. ⟨hal-00001141⟩
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