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    Measuring the Chern number of Hofstadter bands with ultracold bosonic atoms

    Chern numbers characterize the quantum Hall effect conductance—non-zero values are associated with topological phases. Previously only spotted in electronic systems, they have now been measured in ultracold at...

    M. Aidelsburger, M. Lohse, C. Schweizer, M. Atala, J. T. Barreiro in Nature Physics (2015)