Abstract
Employing the external degrees of freedom of atoms as synthetic dimensions renders easy and new accesses to quantum engineering and quantum simulation. As a recent development, ultracold atoms suffering from two-photon Bragg transitions can be diffracted into a series of discrete momentum states to form a momentum lattice. Here we provide a detailed analysis on such a system, and, as a concrete example, report the observation of robust helical Floquet channels, by introducing periodic driving sequences. The robustness of these channels against perturbations is confirmed, as a test for their topological origin captured by Floquet winding numbers. The periodic switching demonstrated here serves as a testbed for more complicated Floquet engieering schemes, and offers exciting opportunities to study novel topological physics in a many-body setting with tunable interactions.
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Contribution to the Topical Issue “Topological Ultracold Atoms and Photonic Systems”, edited by G. Juzeliūnas, R. Ma, Y.-J. Lin and T. Calarco.
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Xiao, T., Xie, D., Gou, W. et al. Periodic driving induced helical Floquet channels with ultracold atoms in momentum space. Eur. Phys. J. D 74, 152 (2020). https://doi.org/10.1140/epjd/e2020-10019-6
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DOI: https://doi.org/10.1140/epjd/e2020-10019-6