Symmetry-protected Bose-Einstein condensation of interacting hardcore bosons

Wilke, Reja H.; Köhler, Thomas; Palm, Felix A.; Paeckel, Sebastian (2023): Symmetry-protected Bose-Einstein condensation of interacting hardcore bosons. Communications Physics, 6 (1). ISSN 2399-3650

Abstract

-symmetry based on a simple geometrical modification, i.e. a site that couples to all lattice sites. 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 Bose-Einstein condensates. The robustness of the condensate against interactions is shown numerically by adding nearest-neighbor interactions, which typically destroy Bose-Einstein condensates. We discuss further applications such as geometrically inducing finite-momentum condensates. Since our solution strategy is based on a generic mapping, our findings are applicable in a broader context, in which a particular state should be protected, by introducing an additional center site.

• Doc-Type: Article (LMU)
• Organisational unit (Faculties): 17 Physics
• DFG subject classification of scientific disciplines: Natural sciences
• DFG: Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - 277974659
• DFG: Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - 491502892