title: Confinement and interaction of single indirect excitons in a voltage-controlled trap formed inside double InGaAs quantum Wells.
abstract: Voltage-tunable quantum traps confining individual spatially indirect and long-living excitons are realized by providing a coupled double quantum well with nanoscale gates. This enables us to study the transition from confined multiexcitons down to a single, electrostatically trapped indirect exciton. In the few exciton regime, we observe discrete emission lines identified as resulting from a single dipolar exciton, a biexciton, and a triexciton, respectively. Their energetic splitting is well described by Wigner-like molecular structures reflecting the interplay of dipolar interexcitonic repulsion and spatial quantization.
authors.affiliation: Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany.
authors.forename: G J
authors.initials: GJ
authors.lastname: Schinner
authors.affiliation: Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Repp
authors.affiliation: Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Schubert
authors.affiliation: Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany.
authors.forename: A K
authors.initials: AK
authors.lastname: Rai
authors.affiliation: Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Reuter
authors.affiliation: Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany.
authors.forename: A D
authors.initials: AD
authors.lastname: Wieck
authors.affiliation: Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany and Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA.
authors.forename: A O
authors.initials: AO
authors.lastname: Govorov
authors.affiliation: Walter Schottky Institut and Physik-Department, Am Coulombwall 4a, Technische Universität München, D-85748 Garching, Germany.
authors.forename: A W
authors.initials: AW
authors.lastname: Holleitner
authors.affiliation: Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany.
authors.forename: J P
authors.initials: JP
authors.lastname: Kotthaus