Polarons, dressed molecules and itinerant ferromagnetism in ultracold Fermi gases
Polarons, dressed molecules and itinerant ferromagnetism in ultracold Fermi gases
In this review, we discuss the properties of a few impurity atoms immersed in a gas of ultracold fermions—the so-called Fermi polaron problem. On one hand, this many-body system is appealing because it can be described almost exactly with simple diagrammatic and/or variational theoretical approaches. On the other, it provides …