Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-07-19
Phys. Rev. B 74, 214517 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 11 figures: new data for superfluid density anisotropy
Scientific paper
10.1103/PhysRevB.74.214517
Using large-scale quantum Monte Carlo simulations we study bosons hopping on a triangular lattice with nearest (V) and next-nearest (V') neighbor repulsive interactions. In the limit where V=0 but V' is large, we find an example of an unusual period-three striped supersolid state that is stable at 1/2-filling. We discuss the relationship of this state to others on the rich ground-state phase diagram, which include a previously-discovered nearest-neighbor supersolid, a uniform superfluid, as well as several Mott insulating phases. We study several superfluid- and supersolid-to-Mott phase transitions, including one proposed by a recent phenomenological dual vortex field theory as a candidate for an exotic deconfined quantum critical point. We find no examples of unconventional quantum criticality among any of the interesting phase transitions in the model.
Burkov Andriy
Maestro Adrian Del
Melko Roger G.
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