Measurement of an exciton Rabi rotation in a single GaN/Al(x)Ga(1-x)N nanowire-quantum dot using photoluminescence spectroscopy: evidence for coherent control.

Experimental observation of excited state exciton Rabi rotation in a single GaN quantum dot is presented. The dot is embedded in a site-controlled GaN/AlGaN nanowire. Damped oscillation is observed in the power-dependent spectra of the quantum-dot ground state upon resonant pumping of an excited state that had been identified by photoluminescence excitation spectroscopy. A discussion on the origins of the damping is given.