期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 80, 期 11, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.113001
关键词
Bose gas; ultracold polar molecules; optical lattice; dipole-dipole interaction; supersolid
资金
- Global COE Program The Physical Science Frontier
- Ministry of Education, Culture, Sports, Science and Technology, Japan [22340111, 19052004, 21740245]
- Grants-in-Aid for Scientific Research [21740245, 22340111] Funding Source: KAKEN
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.
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