title: Experimental reconstruction of the Berry curvature in a Floquet Bloch band.
abstract: Topological properties lie at the heart of many fascinating phenomena in solid-state systems such as quantum Hall systems or Chern insulators. The topology of the bands can be captured by the distribution of Berry curvature, which describes the geometry of the eigenstates across the Brillouin zone. Using fermionic ultracold atoms in a hexagonal optical lattice, we engineered the Berry curvature of the Bloch bands using resonant driving and show a full momentum-resolved measurement of the ensuing Berry curvature. Our results pave the way to explore intriguing phases of matter with interactions in topological band structures.
authors.affiliation: Institut für Laserphysik (ILP), Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany. Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Fläschner
authors.affiliation: Institut für Laserphysik (ILP), Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany. Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: B S
authors.initials: BS
authors.lastname: Rem
authors.affiliation: Institut für Laserphysik (ILP), Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Tarnowski
authors.affiliation: Institut für Laserphysik (ILP), Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Vogel
authors.affiliation: Institut für Laserphysik (ILP), Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: D-S
authors.initials: DS
authors.lastname: Lühmann
authors.affiliation: Institut für Laserphysik (ILP), Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany. Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany. Zentrum für Optische Quantentechnologien (ZOQ), Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany. klaus.sengstock@physnet.uni-hamburg.de.
authors.forename: K
authors.initials: K
authors.lastname: Sengstock
authors.affiliation: Institut für Laserphysik (ILP), Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany. Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Weitenberg