Abstract
We investigated the effect of magnetic field on the vacuum Rabi coupling strength ( Ω H H x ) in very high quality semiconductor quantum microcavity structures. Keeping the exciton and photon on-resonance at each magnetic field ( B) by varying the temperature, we observed an increase in Ω H H x by a factor of 1.4 when B is increased from 0 to 14T. Using transfer matrix reflectivity simulations we deduced an increase in exciton oscillator strength of 2.2, in very reasonable agreement with predictions of quantum well exciton calculations. An additional weaker splitting, attributed to exciton Zeeman splitting (Δ z) was also seen. We make a comparison of on and off-resonance spectra at B = 12 T.
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