Bosonic superfluid-insulator transition in continuous space
We investigate the zero-temperature phase diagram of interacting Bose gases in the presence of a simple cubic optical lattice, going beyond the regime where the mapping to the single-band Bose-Hubbard model is reliable. Our computational approach is a new hybrid quantum Monte Carlo method which comb...
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| Published in | Physical review letters Vol. 108; no. 15; p. 155301 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
13.04.2012
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| Online Access | Get more information |
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| Summary: | We investigate the zero-temperature phase diagram of interacting Bose gases in the presence of a simple cubic optical lattice, going beyond the regime where the mapping to the single-band Bose-Hubbard model is reliable. Our computational approach is a new hybrid quantum Monte Carlo method which combines algorithms used to simulate homogeneous quantum fluids in continuous space with those used for discrete lattice models of strongly correlated systems. We determine the critical interaction strength and optical lattice intensity where the superfluid-to-insulator transition takes place, considering also the regime of shallow optical lattices and strong interatomic interactions. The implications of our findings for the supersolid state of matter are discussed. |
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| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.108.155301 |