title: Quantum gases.
abstract: Ultracold quantum gases are proving to be a powerful model system for strongly interacting electronic many-body systems. This Perspective explores how such atomic ensembles can help to unravel some of the outstanding open questions in the field.
authors.affiliation: Johannes-Gutenberg Universität, 55118 Mainz, Germany. bloch@uni-mainz.de
authors.forename: Immanuel
authors.initials: I
authors.lastname: Bloch