Manifestation of unconventional biexciton states in quantum dots

Gerald Hönig (), Gordon Callsen, Andrei Schliwa, Stefan Kalinowski, Christian Kindel, Satoshi Kako, Yasuhiko Arakawa, Dieter Bimberg and Axel Hoffmann
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Gerald Hönig: Institut für Festkörperphysik, Technische Universität Berlin
Gordon Callsen: Institut für Festkörperphysik, Technische Universität Berlin
Andrei Schliwa: Institut für Festkörperphysik, Technische Universität Berlin
Stefan Kalinowski: Institut für Festkörperphysik, Technische Universität Berlin
Christian Kindel: Institut für Festkörperphysik, Technische Universität Berlin
Satoshi Kako: Institute of Industrial Science, University of Tokyo
Yasuhiko Arakawa: Institute of Industrial Science, University of Tokyo
Dieter Bimberg: Institut für Festkörperphysik, Technische Universität Berlin
Axel Hoffmann: Institut für Festkörperphysik, Technische Universität Berlin

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Although semiconductor excitons consist of a fermionic subsystem (electron and hole), they carry an integer net spin similar to Cooper-electron-pairs. While the latter cause superconductivity by forming a Bose–Einstein-condensate, excitonic condensation is impeded by, for example, a fast radiative decay of the electron-hole pairs. Here, we investigate the behaviour of two electron-hole pairs in a quantum dot with wurtzite crystal structure evoking a charge carrier separation on the basis of large spontaneous and piezoelectric polarizations, thus reducing carrier overlap and consequently decay probabilities. As a direct consequence, we find a hybrid-biexciton complex with a water molecule-like charge distribution enabling anomalous spin configurations. In contrast to the conventional-biexciton complex with a net spin of s=0, the hybrid-biexciton exhibits s=±3, leading to completely different photoluminescence signatures in addition to drastically enhanced charge carrier-binding energies. Consequently, the biexcitonic cascade via the dark exciton can be enhanced on the rise of temperature as approved by photon cross-correlation measurements.

Date: 2014
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DOI: 10.1038/ncomms6721

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