Polarization fine-structure and enhanced single-photon emission of   self-assembled lateral InGaAs quantum dot molecules embedded in a planar   micro-cavity
  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. 
C. Hermannst\"adter (1), M. Witzany (1), G. J. Beirne (1), W.-M.   Schulz (1), M. Eichfelder (1), R. Rossbach (1), M. Jetter...