Novel mechanism of supersolid of ultracold polar molecules in optical lattices

Takahiro Ohgoe, Takafumi Suzuki, Naoki Kawashima

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We study the checkerboard supersolid of the hard-core Bose-Hubbard model with the dipole-dipole interaction. This supersolid is different from all other supersolids found in lattice models in the sense that superflow paths through which interstitials or vacancies can hop freely are absent in the crystal. By focusing on repulsive interactions between interstitials, we reveal that the long-range tail of the dipole-dipole interaction has the role of increasing the energy cost of domain wall formations. This effect produces the supersolid by the second-order hopping process of defects. We also perform exact quantum Monte Carlo simulations and observe a novel double peak structure in the momentum distribution of bosons, which is clear evidence of a supersolid. This can be measured by the time-of-flight experiment in optical lattice systems.

Original languageEnglish
Article number113001
Journaljournal of the physical society of japan
Volume80
Issue number11
DOIs
Publication statusPublished - 2011 Nov 1
Externally publishedYes

Keywords

  • Bose gas
  • Dipole-dipole interaction
  • Optical lattice
  • Supersolid
  • Ultracold polar molecules

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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