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Plot of the photon number occupation ⟨â†â⟩ and double photon number ⟨â†â†ââ⟩ for the GaAs quantum ring as a function of the electron-photon coupling strength λα. The inset shows the region λα ∈ [0.06, 0.09] meV1/2/nm. When the double occupancy becomes significant, the OEP approximation starts to fail (see text for more detail).
