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Supersolid Stripe Crystal from Finite-Range Interactions on a Lattice

Abstract : Strong, long-range interactions present a unique challenge for the theoretical investigation of quantum many-body lattice models, due to the generation of large numbers of competing states at low energy. Here, we investigate a class of extended bosonic Hubbard models with off-site terms interpolating between short and infinite range, thus allowing for an exact numerical solution for all interaction strengths. We predict a novel type of stripe crystal at strong coupling. Most interestingly, for intermediate interaction strengths we demonstrate that the stripes can turn superfluid, thus leading to a self-assembled array of quasi-one-dimensional superfluids. These bosonic superstripes turn into an isotropic supersolid with decreasing the interaction strength. The mechanism for stripe formation is based on cluster self-assembling in the corresponding classical ground state, reminiscent of classical soft-matter models of polymers, different from recently proposed mechanisms for cold gases of alkali or dipolar magnetic atoms.
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https://hal-ens-lyon.archives-ouvertes.fr/ensl-02324623
Contributor : Fabio Mezzacapo <>
Submitted on : Tuesday, October 22, 2019 - 3:49:07 AM
Last modification on : Tuesday, November 19, 2019 - 2:37:42 AM

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Guido Masella, Adriano Angelone, Fabio Mezzacapo, Guido Pupillo, Nikolay V. Prokof’ev. Supersolid Stripe Crystal from Finite-Range Interactions on a Lattice. Physical Review Letters, American Physical Society, 2019, 123 (4), ⟨10.1103/PhysRevLett.123.045301⟩. ⟨ensl-02324623⟩

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