Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 61: Quantum Gases: Fermions II

Q 61.2: Talk

Friday, March 4, 2016, 11:15–11:30, e001

Experimental reconstruction of the Berry curvature in a topological Bloch band — •Nick Fläschner, Benno Rem, Matthias Tarnowski, Dominik Vogel, Dirk-Sören Lühmann, Klaus Sengstock, and Christof Weitenberg — Institut für Laserphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Topological properties lie at the heart of many fascinating phenomena in solid state systems such as quantum Hall systems or Chern insulators. The topology can be captured by the distribution of Berry curvature, which describes the geometry of the eigenstates across the Brillouin zone. Employing fermionic ultracold atoms in a hexagonal optical lattice, we generate topological 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.