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Q: Fachverband Quantenoptik und Photonik
Q 25: Poster: Quantum Optics and Photonics I
Q 25.7: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Atrium Informatik
Dynamics of weakly interacting bosons in optical lattices with flux — •Ana Hudomal1, Ivana Vasić1, Hrvoje Buljan2, Walter Hofstetter3, and Antun Balaž1 — 1Scientific Computing Laboratory, Center for the Study of Complex Systems, Institute of Physics Belgrade, University of Belgrade, Serbia — 2Department of Physics, Faculty of Science, University of Zagreb, Croatia — 3Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany
Realization of strong synthetic magnetic fields in driven optical lattices has enabled implementation of topological bands in cold-atom setups [1,2]. A milestone has been reached by a recent measurement of a finite Chern number based on the dynamics of incoherent bosonic atoms [2]. Motivated by these recent developments, we investigate the dynamics of weakly interacting incoherent bosons in a two-dimensional driven optical lattice exposed to an external force, which provides a direct probe of the Chern number [3]. We find that interactions lead to the redistribution of atoms over topological bands both through the conversion of interaction energy into kinetic energy during the expansion of the atomic cloud and due to an additional heating. Remarkably, we observe that the moderate atomic repulsion facilitates the measurement by flattening the distribution of atoms in the quasimomentum space.
[1] G. Jotzu et al., Nature 515, 237 (2014).
[2] M. Aidelsburger et al., Nature Phys. 11, 162 (2015).
[3] A. Hudomal et al., Phys. Rev. A 98, 053625 (2018).