Extended Data Fig. 5: Impurity quasiparticle weight in the Fermi polaron problem for α = 23/40.
From: Transition from a polaronic condensate to a degenerate Fermi gas of heteronuclear molecules
The quasiparticle weight of the impurity as a function of the interaction strength is shown as obtained from the fRG (red, solid) and the NSCT approach (black, dashed). While both methods yield similar results they differ in the prediction of the point where the polaron-to-molecule transitions occurs, beyond which the occupied quasiparticle weight drops to zero. To indicate the effect of finite boson density, the condensate fraction of the mixture computed in NSCT is shown for nB = nF (black solid, also shown in Fig. 1d).
