Weak and strong coupling polarons in binary Bose–Einstein condensates

Abstract The Bose polaron is a quasiparticle that arises from the interaction between impurities and Bogoliubov excitation in Bose–Einstein condensates, analogous to the polaron formed by electrons and phonons in solid-state physics. In this paper, we investigate the effect of phase separation on weakly coupled and strongly coupled Bose polarons. Our findings reveal that phase separation induces a remarkable alteration in the properties of weakly coupled Bose polarons. However, in the case of strong coupling, phase separation cannot destroy the highly self-trapping state of Bose polarons.