We characterized stacked double-pyramidal quantum dots which showed biexciton binding energies close to zero by means of photoluminescence and cross-correlation measurements. It was possible to obtain a sequence of two photons with (nearly) the same energy from the biexciton-exciton-ground state cascade, as corroborated by a basic rate-equation model. This type of two-photon emission is both of relevance for fundamental quantum information theory studies as well as for more exotic applicative fields such as quantum biology.
@article{arxiv.1810.10243,
title = {Vanishing biexciton binding energy from stacked, MOVPE grown, site-controlled pyramidal quantum dots for twin photon generation},
author = {Stefano T. Moroni and Simone Varo and Gediminas Juska and Tung-Hsun Chung and Agnieszka Gocalinska and Emanuele Pelucchi},
journal= {arXiv preprint arXiv:1810.10243},
year = {2018}
}