title: Tunable photoemission from an excitonic antitrap.
abstract: We study the influence of lithographically defined, electrostatic trap configurations on the photon emission from dipolar excitons in coupled quantum wells. The emission is surprisingly enhanced for an excitonic antitrap compared to a trap configuration, an effect more pronounced for a trap with smaller diameter. We explain the observations by the interplay between the exciton formation process, the lateral charge-carrier dynamics, and the dipole-dipole interactions between the excitons. Exploiting this interplay allows us to efficiently tune the excitonic emission energy with very small intensity variation.
authors.affiliation: Fakultät für Physik and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, D-80539 München, Germany. k.kowalik@physik.uni-muenchen.de
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Kowalik-Seidl
authors.forename: Xaver P
authors.initials: XP
authors.lastname: Vögele
authors.forename: Bernhard N
authors.initials: BN
authors.lastname: Rimpfl
authors.forename: Georg J
authors.initials: GJ
authors.lastname: Schinner
authors.forename: Dieter
authors.initials: D
authors.lastname: Schuh
authors.forename: Werner
authors.initials: W
authors.lastname: Wegscheider
authors.forename: Alexander W
authors.initials: AW
authors.lastname: Holleitner
authors.forename: Jörg P
authors.initials: JP
authors.lastname: Kotthaus
mesh_terms: D003198:Computer Simulation; D008027:Light; D008029:Lighting / Q000379:methods*; D008962:Models, Theoretical; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D017785:Photons; D012542:Scattering, Radiation