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26 April 2024

» arxiv » 0809.2544

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Polarization fine-structure and enhanced single-photon emission of self-assembled lateral InGaAs quantum dot molecules embedded in a planar micro-cavity
C. Hermannstädter ; M. Witzany ; G. J. Beirne ; W.-M. Schulz ; M. Eichfelder ; R. Rossbach ; M. Jetter ; L. Wang ; A. Rastelli ; O. G. Schmidt ; P. Michler ;
Date:	15 Sep 2008
Abstract:	Single lateral InGaAs quantum dot molecules have been embedded in a planar micro-cavity in order to increase the luminescence extraction efficiency. Using a combination of metal-organic vapor phase and molecular beam epitaxy samples could be produced that exhibit a 30 times enhanced single-photon emission rate. We also show that the single-photon emission is fully switchable between two different molecular excitonic recombination energies by applying a lateral electric field. Furthermore, the presence of a polarization fine-structure splitting of the molecular neutral excitonic states is reported which leads to two polarization-split classically correlated biexciton exciton cascades. The fine-structure splitting is found to be on the order of 10 micro-eV.
Source:	arXiv, 0809.2544
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