Single quantum dot photocurrent spectroscopy in the cavity quantum electrodynamics regime

We study cavity quantum electrodynamics (cQED) in coupled quantum dot microcavity systems under electrical readout. Strict resonant excitation of a target QD allows us to monitor the photocurrent response of a single emitter in the quantum limit of light-matter interaction. We find a strong anticorrelation between radiative recombination and non-radiative tunnel escape of photoexcited carries which can be controlled by cQED effects in the Purcell regime. In fact, cavity-enhanced radiative emission from a QD results in a weaker photocurrent signal which reflects the cQED controlled competition between radiative and non-radiative recombination at the single emitter level. ∗ stephan.reitzenstein@physik.tu-berlin.de