Abstract: Ultracold atomic gases have proven to provide valuable platforms to simulate quantum systems arising in disparate areas of physics. Polarons are well-studied quasiparticles in solid-state systems that describe an electron dressed by lattice distortions. The so-called Frohlich model is the typical starting point for theoretically describing such systems. More recently, polarons arising in Bose-Einstein condensates have been the focus of much attention, both theoretical and experimental. For such systems, the Bogoliubov phonons play the role of the lattice vibrations of a solid. Furthermore, by using a Feshbach resonance the strong and weak coupling regimes are readily accessed in experiments. In this talk, I will describe a recent framework developed to understand Bose-polarons in ultracold atomic gases. This framework incorporates the back action of the impurity on the BEC at the mean field level and forms a natural starting point for incorporating quantum fluctuations.
Time permitting, I also hope to discuss separate but related work describing topological band systems which can arise in ultracold atomic gases. In particular, I will discuss so-called local topological markers which can naturally be used to characterise topological band systems that do not have translational invariance.
Phys. Rev. Research 2, 033142 (2020)
arXiv:2111.07957
Phys. Rev. B 103, 155134 (2021)
Location: ATL4402