Cascaded emission of single photons from the biexciton in monolayered WSe2

• DOI: 10.1038/ncomms13409
• Publication Date: 2016-11-10T10:11:59Z
• Authors: Yu-Ming He; Oliver Iff; Nils Lundt; Vasilij Baumann; Marcelo Davanco; Kartik Srinivasan; Sven Höfling; Christian Schneider
• Keywords: Biexciton; Trion

Monolayers of transition metal dichalcogenide materials emerged as a new material class to study excitonic effects in solid state, since they benefit from enormous coulomb correlations between electrons and holes. Especially WSe2, sharp emission features have been observed at cryogenic temperatures, which act single photon sources . Tight exciton localization has assumed induce an anharmonic excitation spectrum, however, the evidence hypothesis, namely demonstration localized biexciton, is elusive. Here, we unambiguously demonstrate existence biexciton monolayer triggers cascade photons. The identified by its time-resolved photoluminescence, superlinearity distinct polarization micro-photoluminescence experiments. We cascaded nature process cross-correlation experiment, yields strong bunching behavior. Our work paves way generation quantum optics experiments with two-dimensional semiconductors.