Dynamic Stark Effect in Strongly Coupled Microcavity Exciton-Polaritons
  We present experimental observations of a non-resonant dynamic Stark shift in strongly coupled microcavity quantum well exciton-polaritons - a system which provides a rich variety of solid-state collective phenomena. The Stark effect is demonstrated in a GaAs/AlGaAs system at 10K by femtosecond pump-probe measurements, with the blue shift approaching the meV scale for a pump fluence of 2 mJcm^-2 and 50 meV red detuning, in good agreement with theory. The energy level structure of the strongly coupled polariton Rabi-doublet remains unaffected by the blue shift. The demonstrated effect should allow generation of ultrafast density-independent potentials and imprinting well-defined phase profiles on polariton condensates, providing a powerful tool for manipulation of these condensates, similar to dipole potentials in cold atom systems. 
Alex Hayat, Christoph Lange, Lee A. Rozema, Ardavan Darabi, Henry M.   van Driel, Aephraim M. Steinberg, Bryan Nelsen, David...
cond-mat.quant-gas cond-mat.mes-hall physics.optics quant-ph