Ground state of the polaron in an ultracold dipolar Fermi gas

An impurity atom immersed in an ultracold atomic Fermi gas can form a quasiparticle, so-called polaron, due to impurity-fermion interaction. We consider three-dimensional homogeneous dipolar as medium, where the interatomic dipole-dipole interaction (DDI) makes surface deformed into spheroidal shape, and, using Chevy-type variational method, investigate ground-state properties of polaron: effective mass, momentum distribution particle-hole (p-h) excitation, drag parameter, and medium density modification around impurity. These quantities are shown exhibit spatial anisotropies such way reflect anisotropy background gas. have also given numerical results for polaron at unitarity limit case which fermion masses equal. It has been found that transverse mass parameter both tend decrease by $ \sim 10\%$ when DDI strength is raised from $0$ up its critical value, while longitudinal ones very weak dependence on DDI.