Fractonic Luttinger Liquids and Supersolids in a Constrained Bose-Hubbard Model

• URL: http://arxiv.org/abs/2210.11072v2
• Date: Tue, 4 Jul 2023 09:49:09 GMT
• Title: Fractonic Luttinger Liquids and Supersolids in a Constrained Bose-Hubbard Model
• Authors: Philip Zechmann, Ehud Altman, Michael Knap, Johannes Feldmeier
• Abstract summary: We show the existence of a variety of exotic quantum phases in the ground states of a Bose-Hubbard model in one dimension. For integer boson fillings, we perform a mapping of the system to a model of microscopic local dipoles, which are composites of fractons. We apply a combination of low-energy field theory and large-scale tensor network simulations to demonstrate the emergence of a dipole Luttinger liquid phase.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum many-body systems with fracton constraints are widely conjectured to exhibit unconventional low-energy phases of matter. In this work, we demonstrate the existence of a variety of such exotic quantum phases in the ground states of a dipole-moment conserving Bose-Hubbard model in one dimension. For integer boson fillings, we perform a mapping of the system to a model of microscopic local dipoles, which are composites of fractons. We apply a combination of low-energy field theory and large-scale tensor network simulations to demonstrate the emergence of a dipole Luttinger liquid phase. At non-integer fillings our numerical approach shows an intriguing compressible state described by a quantum Lifshitz model in which charge density-wave order coexists with dipole long-range order and superfluidity - a `dipole supersolid'. While this supersolid state may eventually be unstable against lattice effects in the thermodynamic limit, its numerical robustness is remarkable. We discuss potential experimental implications of our results.

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