Extended Data Fig. 1: Dependence of the polaron energy on the impurity concentration.
From: Mediated interactions between Fermi polarons and the role of impurity quantum statistics
For the FF case, the main steps of measurements and data analysis are illustrated. a, Two exemplary spectroscopy signals (normalized to the initial atom number) taken at X = − 1.41 for different values of the interacting impurity concentration (blue squares \(\tilde{{{{\mathcal{C}}}}}=0.17\), orange diamonds \(\tilde{{{{\mathcal{C}}}}}=0.09\)). The solid lines are fits with a Gaussian function on a linear background (the latter being negligibly small in the present data). The error bars represent the standard errors from typically 5-6 measurement repetitions. b, Polaron energy as a function of impurity concentration for X = − 1.41. The blue square and the orange diamond correspond to the exemplary spectra presented in panel a. The black line represents a linear fit to the data with the dashed line showing the extrapolation to zero density. c, Polaron energy as a function of impurity concentration for different values of the interaction parameter X. From center to top (blue to red) increasing repulsion, from center to bottom (green to red) increasing attraction. Statistical uncertainties for b and c are evaluated taking into account fit uncertainties from analyzing the spectra and errors on the Fermi energy.
