Efimov Resonances in Ultracold Quantum Gases

TL;DR

This paper reviews recent experimental advances in observing Efimov resonances in ultracold cesium gases, highlighting universal few-body physics phenomena and presenting new resonance observations.

Contribution

It provides a comprehensive review of Efimov physics in ultracold gases and reports new experimental observations of Efimov resonances.

Findings

Confirmation of Efimov resonance predictions in cesium gases

Observation of atom-dimer and four-body Efimov resonances

New experimental data supporting universal few-body theory

Abstract

Ultracold atomic gases have developed into prime systems for experimental studies of Efimov three-body physics and related few-body phenomena, which occur in the universal regime of resonant interactions. In the last few years, many important breakthroughs have been achieved, confirming basic predictions of universal few-body theory and deepening our understanding of such systems. We review the basic ideas along with the fast experimental developments of the field, focussing on ultracold cesium gases as a well-investigated model system. Triatomic Efimov resonances, atom-dimer Efimov resonances, and related four-body resonances are discussed as central observables. We also present some new observations of such resonances, supporting and complementing the set of available data.