Fig. 4: Polariton–polariton interaction.
From: Observation of quantum depletion in a non-equilibrium exciton–polariton condensate
a Condensate energies (chemical potential μ = gn) extracted from Bogoliubov dispersion fitting for three different values of detuning (other detuning values are not presented for clarity of the plot). Error bars express the goodness of fit of the excitation spectrum. b Summary of extracted interaction strengths per single quantum well as a function of the excitonic Hopfield coefficient (exciton fraction). Orange dots represent data collected from fitting the GB dispersion, as described in the text. The data are in excellent agreement with values obtained from an independent experiment in a pulsed excitation regime27 (black dots). Fit to the data using a quadratic function of |X|2 is shown with a dashed line. Error bars represent the estimated inaccuracy of the detuning and the error originating from inhomogeneities of the condensate profile27.
