Radiative Dark-Bright Instability and Critical Casimir Effect in DQW Exciton Condensates

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dc.citation.epage1048en_US
dc.citation.issueNumber14-15en_US
dc.citation.spage1045en_US
dc.citation.volumeNumber151en_US
dc.contributor.authorHakioglu, T.en_US
dc.contributor.authorÖzgün E.en_US
dc.date.accessioned2015-07-28T12:06:10Z
dc.date.available2015-07-28T12:06:10Z
dc.date.issued2011en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractIt is already well known that radiative interband interaction in the excitonic normal liquid in semiconducting double quantum wells is responsible for a negligible splitting between the energies of the dark and bright excitons enabling us to consider a four fold spin degeneracy. This has also lead many workers to naively consider the same degeneracy in studying the condensate. On the other hand, the non-perturbative aspects of this interaction in the condensed phase, e.g. its consequences on the order parameter and the dark-bright mixture in the ground state have not been explored. In this work, we demonstrate that the ground state concentrations of the dark and the bright exciton condensates are dramatically different beyond a sharp interband coupling threshold where the contribution of the bright component in the ground state vanishes. This shows that the effect of the radiative interband interaction on the condensate is nonperturbative. We also observe in the free energy a discontinuous derivative with respect to the layer separation at the entrance to the condensed phase, indicating a strong critical Casimir force. An estimate of its strength shows that it is measurable. Measuring the Casimir force is challenging, but at the same time it has a conclusive power about the presence of the long sought for condensed phase.en_US
dc.identifier.doi10.1016/j.ssc.2011.04.015en_US
dc.identifier.issn0038-1098
dc.identifier.urihttp://hdl.handle.net/11693/13399
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/j.ssc.2011.04.015en_US
dc.source.titleSolid State Communicationsen_US
dc.subjectSemiconductoren_US
dc.subjectQuantum wellen_US
dc.subjectRadiation effectsen_US
dc.subjectElectron-electron interactionen_US
dc.titleRadiative Dark-Bright Instability and Critical Casimir Effect in DQW Exciton Condensatesen_US
dc.typeArticleen_US

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