Giant optomechanical coupling and dephasing protection with cavity exciton-polaritons
P. Sesin, А. С. Кузнецов, G. Rozas, S. Anguiano, A. Bruchhausen, A. Lemaı̂tre, K. Biermann, P. V. Santos, A. Fainstein
Abstract
Cavity optomechanics involving exciton-polaritons leads to a strongly enhanced optomechanical coupling by adding to the standard radiation-pressure mechanism a resonantly enhanced deformation potential interaction. Resonant Brillouin scattering experiments and photoluminescence with electrically injected GHz bulk acoustic waves are reported to demonstrate that single-particle resonant optomechanical couplings with GHz vibrations can reach record values in the tens of MHz range. Interestingly, the opening of the Rabi gap in the exciton-photon strong-coupling regime allows full access to resonance, protecting against dephasing induced by the exciton inhomogeneous broadening.