Triggered single-photon emission of individualacceptor-bound excitons in ZnSe:N

摘要

We have investigated individual impurity centers in mesa-etched ZnSe:Nnanostructures by use of spatially resolved μ-PL spectroscopy. We found single resolutionlimited lines in the energy region of the nitrogen acceptor-bound exciton complex. These linesdisplay almost perfect triggered single-photon emission in photon correlation measurementsunder pulsed optical excitation (82 MHz) at low temperature (4 K). Additonally, wedemonstrate triggered two-photon emission with different emission energies of each photon.Our results suggest that individual shallow impurity centers are well suited for quantum opticalexperiments and for the implementation in photon turnstile devices.