  Bose-Hubbard models are simple paradigmatic lattice models used to study
dynamics and phases of quantum bosonic matter. We combine the extended
Bose-Hubbard model in the hard-core regime with ring-exchange hoppings. By
investigating the symmetries and low-energy properties of the Hamiltonian we
argue that the model hosts fractonic defect excitations. We back up our claims
with exact numerical simulations of defect dynamics exhibiting mobility
constraints. Moreover, we confirm the robustness of our results against fracton
symmetry breaking perturbations. Finally we argue that this model can be
experimentally realized in recently proposed quantum simulator platforms with
big time crystals, thus paving a way for the controlled study of many-body
dynamics with mobility constraints.
