Confinement and interaction of single indirect excitons in a voltage-controlled trap formed inside double InGaAs quantum Wells

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 excito...

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Bibliographic Details
Published in:Physical review letters 2013-03, Vol.110 (12), p.127403-127403, Article 127403
Main Authors: Schinner, G J, Repp, J, Schubert, E, Rai, A K, Reuter, D, Wieck, A D, Govorov, A O, Holleitner, A W, Kotthaus, J P
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.110.127403