Symmetry-protected Bose-Einstein condensation of interacting hardcore Bosons

R. H. Wilke; T. Köhler; F. A. Palm; S. Paeckel

doi:10.1038/s42005-023-01303-z

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arXiv · 2110.15770

Symmetry-protected Bose-Einstein condensation of interacting hardcore Bosons

R. H. Wilke·T. Köhler·F. A. Palm·S. Paeckel

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Abstract

We introduce a mechanism stabilizing a one-dimensional quantum many-body phase, characterized by a certain wave vector $k_0$, from a $k_0$-modulated coupling to a center site, via the protection of an emergent $\mathbb Z_2$ symmetry. We illustrate this mechanism by constructing the solution of the full quantum many-body problem of hardcore bosons on a wheel geometry, which are known to form a Bose-Einstein condensate. The robustness of the condensate is shown numerically by adding nearest-neighbor interactions to the wheel Hamiltonian. We identify the energy scale that controls the protection of the emergent $\mathbb Z_2$ symmetry. We discuss further applications such as geometrically inducing finite-momentum condensates. Since our solution strategy is based on a generic mapping from a wheel geometry to a projected ladder, our analysis can be applied to various related problems with extensively scaling coordination numbers.

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R. H. Wilke, T. Köhler, F. A. Palm, S. Paeckel. 2021-10-29. Symmetry-protected Bose-Einstein condensation of interacting hardcore Bosons. https://doi.org/10.1038/s42005-023-01303-z

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