Commensurate supersolid of three-dimensional lattice bosons

Takahiro Ohgoe, Takafumi Suzuki, Naoki Kawashima

研究成果: Article査読

26 被引用数 (Scopus)

抄録

Using an unbiased quantum MonteCarlo method, we obtain convincing evidence of the existence of a checkerboard supersolid at a commensurate filling factor 1/2 (a commensurate supersolid) in the soft-core Bose-Hubbard model with nearest-neighbor repulsions on a cubic lattice. In conventional cases, supersolids are realized at incommensurate filling factors by a doped-defect-condensation mechanism, where particles (holes) doped into a perfect crystal act as interstitials (vacancies) and delocalize in the crystal order. However, in the model, a supersolid state is stabilized even at the commensurate filling factor 1/2 without doping. By performing grand canonical simulations, we obtain a ground-state phase diagram that suggests the existence of a supersolid at a commensurate filling. To obtain direct evidence of the commensurate supersolid, we next perform simulations in canonical ensembles at a particle density ρ=1/2 and exclude the possibility of phase separation. From the obtained snapshots, we discuss its microscopic structure and observe that interstitial-vacancy pairs are unbound in the crystal order.

本文言語English
論文番号185302
ジャーナルPhysical Review Letters
108
18
DOI
出版ステータスPublished - 2012 5 3
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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