Striped Supersolid Phase and the Search for Deconfined Quantum Criticality in Hard-Core Bosons on the Triangular Lattice

Journal Article · Sun Jan 01 00:00:00 EST 2006 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.74.214517· OSTI ID:930887

Melko, Roger G ^[1]; Del Maestro, A. ^[2]; Burkov, A. A. ^[2]

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1. ORNL
2. Harvard University

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 supersolid, a uniform superfluid, as well as several Mott insulating phases. We study several superfluidand 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 930887
• Journal Information: Physical Review B, Vol. 74, Issue 21; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CRITICALITY
PHASE DIAGRAMS