Strongly correlated Bose gases

TL;DR

This paper reviews recent advances in understanding strongly correlated Bose gases, focusing on beyond mean-field effects, Efimov physics, and experimental progress on the unitary Bose gas.

Contribution

It provides a comprehensive overview of theoretical and experimental developments in strongly interacting Bose gases, highlighting non-universal phenomena and future research directions.

Findings

Efimov effect causes non-universal behavior and metastability.

Three-body recombination impacts low-temperature Bose gases.

Recent experiments explore the properties of the unitary Bose gas.

Abstract

The strongly interacting Bose gas is one of the most fundamental paradigms of quantum many-body physics and the subject of many experimental and theoretical investigations. We review recent progress on strongly correlated Bose gases, starting with a description of beyond mean-field corrections. We show that the Efimov effect leads to non universal phenomena and to a metastability of the low temperature Bose gas through three-body recombination to deeply bound molecular states. We outline differences and similarities with ultracold Fermi gases, discuss recent experiments on the unitary Bose gas, and finally present a few perspectives for future research.