Experimental reconstruction of the Berry curvature in a Floquet Bloch band

N. Flaschner, B. S. Rem, M. Tarnowski, D. Vogel, D.- S. Luhmann, K. Sengstock, C. Weitenberg
2016 Science  
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
more » ... ture. Our results pave the way to explore intriguing phases of matter with interactions in topological band structures.
doi:10.1126/science.aad4568 pmid:27230375 fatcat:rb4nahzjjraw3nsblpfv5mhdoi