Polarons and their induced interactions in highly imbalanced triple mixtures

TL;DR

This paper investigates the polaronic properties and induced interactions of impurities in a highly controllable 1D Bose-Bose mixture, revealing how impurity-medium coupling influences quasiparticle behavior and bipolaron formation.

Contribution

It introduces a flexible platform to control polaronic properties via impurity-boson coupling in a triple mixture, highlighting the role of correlations and trap effects.

Findings

Control of polaronic residue and interactions through impurity coupling

Maintenance of quasiparticle character at higher interaction strengths

Identification of bipolaron formation in strong attractive regimes

Abstract

We unravel the polaronic properties of impurities immersed in a correlated trapped one-dimensional (1D) Bose-Bose mixture. This setup allows for the impurities to couple either attractively or repulsively to a specific host, thus offering a highly flexible platform for steering the emergent polaronic properties. Specifically, the polaronic residue peak and strength of induced interactions can be controlled by varying the coupling of the impurities to the individual bosonic components. In particular, it is possible to maintain the quasiparticle character for larger interaction strengths as compared to the case of impurities immersed in a single bosonic species. We explicate a hierarchy of the polaron binding energies in terms of the impurity-medium interactions, thereby elucidating the identification of the polaronic resonances in recent experimental radiofrequency schemes. For strong attractive impurity-medium couplings bipolaron formation is captured. Our findings pave the way for continuously changing the quasiparticle character, under the impact of trap effects, while exposing the role of correlations in triple mixture settings.