Supersolid Stripe Crystal from Finite-Range Interactions on a Lattice

Guido Masella, Adriano Angelone, Fabio Mezzacapo, Guido Pupillo, and Nikolay V. Prokof’ev
Phys. Rev. Lett. 123, 045301 – Published 26 July 2019
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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.

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  • Received 2 September 2018
  • Revised 21 May 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.045301

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Guido Masella1, Adriano Angelone2,3, Fabio Mezzacapo4,1, Guido Pupillo1, and Nikolay V. Prokof’ev5,1

  • 1icFRC, IPCMS (UMR 7504) and ISIS (UMR 7006), Université de Strasbourg and CNRS, 67000 Strasbourg, France
  • 2Abdus Salam International Centre for Theoretical Physics, strada Costiera 11, 34151 Trieste, Italy
  • 3SISSA, via Bonomea 265, 34136 Trieste, Italy
  • 4Univ Lyon, Ens de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France
  • 5Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA

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Issue

Vol. 123, Iss. 4 — 26 July 2019

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