Peer-Reviewed Journal Details
Mandatory Fields
Troncale, V. and Karlsson, K. F. and Oberli, D. Y. and Byszewski, M. and Malko, A. and Pelucchi, E. and Rudra, A. and Kapon, E.
Journal of Applied Physics
Excited excitonic states observed in semiconductor quantum dots using polarization resolved optical spectroscopy
Optional Fields
We present results on the polarization-resolved photoluminescence emitted from InGaAs/AlGaAs single quantum dots (QDs) grown in inverted tetrahedral pyramids. The emitted light was detected for two mutually perpendicular linear polarization directions in the less conventional cleaved-edge geometry, in addition to the standard top-emission geometry. Whereas the in-plane linear polarization was isotropic, as a consequence of the high symmetry of the system, we found a strong polarization anisotropy of the edge-emitted light revealing QD states of predominantly heavy- or light-hole character. By temperature control of the charge state, several neutral and charged light-hole like exciton complexes were identified. In particular, a biexciton showing a twofold radiative recombination path, leading to two nearly perpendicularly polarized emission multiplets, was identified. These results are also of technological relevance for any design of optoelectronic QD-integrated devices.
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