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We determine experimentally the spinor interaction constants oflower-polaritons $\alpha_1$ and $\alpha_2$ using resonant pump-probespectroscopy with a spectrally narrow pump pulse. Our experimental findings areanalyzed with the Bogoliubov-like theory and mean-field two channel model basedon the lower-polariton and biexciton basis. We find an enhancement of theattractive interaction and dissipative nonlinearity of lower-polaritons withanti-parallel spins in the vicinity of the biexciton resonance when the energyof two lower-polaritons approaches energetically that of the biexciton. Theseobservations are consistent with the existence of a scattering resonancebetween lower-polaritons and biexcitons (polaritonic Feshbach resonance).

Spin anisotropic interactions of lower-polaritons in the vicinity of polaritonic Feshbach resonance