After decades of improvements in cooling techniques of several atomic species and in
finding methods for the achievement of stable quantum mixtures, the field is now ready for …

This review describes the field of Bose polarons, arising when mobile impurities are
immersed into a bosonic quantum gas. The latter can be realized by a Bose-Einstein …

The mobile impurity in a Bose-Einstein condensate (BEC) is a paradigmatic many-body
problem. For weak interaction between the impurity and the BEC, the impurity deforms the …

An impurity particle interacting with a Bose-Einstein condensate (BEC) leads to the
formation of a quasiparticle known as the Bose polaron. We investigate the properties of the …

Spectroscopic and interferometric measurements complement each other in extracting the
fundamental properties of quantum many-body systems. While spectroscopy provides …

The functional determinant approach (FDA) is a simple method to compute exactly certain
observables for ideal quantum systems and has been successfully applied to the Fermi …

Similar to an electron in a solid, an impurity in an atomic Bose-Einstein condensate (BEC) is
dressed by excitations from the medium, forming a polaron quasiparticle with modified …

Important properties of complex quantum many-body systems and their phase diagrams can
often already be inferred from the impurity limit. The Bose polaron problem describing an …

We address the Bose polaron problem of a mobile impurity interacting strongly with a host
Bose-Einstein condensate (BEC) through a Feshbach resonance. On the repulsive side at …

We construct the simplest density functional for the problem of a single impurity interacting
with a Fermi gas via a long-ranged potential using the Thomas-Fermi approach. We find that …