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Topological self-organization of strongly interacting particles

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Abstract

We investigate the self-organization of strongly interacting particles confined in 1D and 2D. We consider hardcore bosons in spinless Hubbard lattice models with short-range interactions. We show that many-body states with topological features emerge at different energy bands separated by large gaps. The topology manifests in the way the particles organize in real space to form states with different energy. Each of these states contains topological defects/condensations whose Euler characteristic can be used as a topological number to categorize states belonging to the same energy band. We provide analytical formulas for this topological number and the full energy spectrum of the system for both sparsely and densely filled systems. Furthermore, we analyze the connection with the Gauss-Bonnet theorem of differential geometry, by using the curvature generated in real space by the particle structures. Our result is a demonstration of how states with topological characteristics, emerge in strongly interacting many-body systems following simple underlying rules, without considering the spin, long-range microscopic interactions, or external fields.

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Authors and Affiliations

  1. Physics Division, National Center for Theoretical Sciences, Hsinchu, 30013, Taiwan

    Ioannis Kleftogiannis

  2. Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel

    Ilias Amanatidis

Authors
  1. Ioannis Kleftogiannis
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  2. Ilias Amanatidis
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Correspondence to Ioannis Kleftogiannis.

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Kleftogiannis, I., Amanatidis, I. Topological self-organization of strongly interacting particles. Eur. Phys. J. B 92, 198 (2019). https://doi.org/10.1140/epjb/e2019-100142-x

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  • DOI: https://doi.org/10.1140/epjb/e2019-100142-x

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