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Journal Articles Physical Review Letters Year : 2019

Supersolid Stripe Crystal from Finite-Range Interactions on a Lattice

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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.

Dates and versions

ensl-02324623 , version 1 (22-10-2019)

Identifiers

Cite

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, 2019, 123 (4), ⟨10.1103/PhysRevLett.123.045301⟩. ⟨ensl-02324623⟩
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