Microcavity Exciton-Polariton Condensates: physics and application
Microcavity exciton-polaritons are hybrid light-matter quasi-particles arising from the mixed states between cavity photons and quantum well excitons. The inherent light-matter duality provides experimental advantages: the stimulated scattering among interacting particles and the small effective mass (~ 10-8 times the hydrogen atom) form coherent condensate states at high temperatures (e.g. 4 K in GaAs and room temperature in GaN materials). In addition, the dynamics of exciton-polaritons is accessed by capturing the leaked photons out of the cavity due to the short lifetime. I will first discuss the fundamental properties of non-equilibrium exciton-polariton condensates with emphasis of open-dissipative nature. As engineering applications, I will present the establishment of exciton-polariton quantum emulators, which may serve as a solid-state platform to investigate strongly correlated materials. And I will show our recent progress of an electrically pumped exciton-polariton device, towards the development of novel coherent light sources operating at low threshold powers.