Many Fermi polarons at nonzero temperature

Abstract

An extremely polarized mixture of an ultracold Fermi gas is expected to reduce to a Fermi polaron system, which consists of a single impurity immersed in the Fermi sea of majority atoms. By developing a many-body T-matrix theory, we investigate spectral properties of the polarized mixture in experimentally relevant regimes in which the system of finite impurity concentration at nonzero temperature is concerned. We explicitly demonstrate presence of polaron physics in the polarized limit and discuss effects of many polarons in an intermediate regime in a selfconsistent manner. By analyzing the spectral function at finite impurity concentration, we extract the attractive and repulsive polaron energies. We find that a renormalization of majority atoms via an interaction with minority atoms and a thermal depletion of the impurity chemical potential are of significance to depict the many-polaron regime.

Many-body quantum dynamics and induced correlations of Bose polarons

“…A intriguing aspect would be to examine whether thermalization of the impurities dynamics takes place for strong repulsions in the framework of the eigenstate thermalization hypothesis [101]. An imperative prospect is to study the robustness of the emergent quasiparticle picture in the current setting in the presence of temperature effects [102,103]. Moreover, the study of induced interactions of two bosonic impurities immersed in a Fermi sea would be an interesting prospect especially in order to expose their dependence on the different statistics of the medium.…”

Dissipative correlated dynamics of a moving impurity immersed in a Bose–Einstein condensate

“…This study will shed light into the presence of the most probably emergent induced interactions between the impurities and would enable us to systematically explore their role in the time-evolution. Additionally, the inclusion of temperature effects in such an investigation would be very interesting [91,92]. Another intriguing direction would be to simulate the corresponding radiofrequency spectrum [17] or the structure factor of the current setup [22,24] by employing spinor impurities in order to identify the possibly emerging polaronic states and subsequently measure e.g.…”

Correlated quantum dynamics of two quenched fermionic impurities immersed in a Bose-Einstein condensate

“…course of the evolution. Also, the inclusion of temperature effects in such an investigation would be highly desirable [110,111]. Another intriguing direction would be to examine the periodically driven dynamics of one and two impurities inside a non-perturbed bosonic bath and subsequently inspect their emergent dissipative motion into the bath with respect to the driving frequency.…”