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The interplay between time-reversal symmetry breaking and strong light-mattercoupling in 2D gases brings intriguing aspects to polariton physics. Thiscombination can lead to polarization/spin selective light-matter interaction inthe strong coupling regime. In this work, we report such a selective stronglight-matter interaction by harnessing a 2D gas in the quantum Hall regimecoupled to a microcavity. Specifically, we demonstrate circular-polarizationdependence of the vacuum Rabi splitting, as a function of magnetic field andhole density. We provide a quantitative understanding of the phenomenon bymodeling the coupling of optical transitions between Landau levels to themicrocavity. This method introduces a control tool over the spin degree offreedom in polaritonic semiconductor systems, paving the way for newexperimental possibilities in light-matter hybrids.

Spin-selective strong light-matter coupling in a 2D hole gas-microcavity system