Direct observation of an ac Stark splitting in semiconductor microcavities excited above the continuum onset
Francesco Quochi, Michele Saba, Cristiano Ciuti +7 more
We study the coherent optical response of a very high-finesse microcavity with a single quantum well by means of degenerate subpicosecond pump-probe spectroscopy. The dynamics of the ac Stark effect versus pump intensity is investigated upon tuning the empty-cavity mode below and above the exciton transition energy, at the exciton continuum onset. The evolution from a simple dynamical excitonic shift to a dynamical splitting is clearly observed in both cases. The qualitative agreement with numerical calculations based on the semiconductor Maxwell-Bloch equations is good.
Physical review. B, Condensed matter•Feb 15, 2000•9 citations