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Chiral phases of two-dimensional hard-core bosons with frustrated ring exchange

AutorHuerga, Daniel ; Dukelsky, Jorge ; Laflorencie, Nicolas; Ortiz, Gerardo
Fecha de publicación2014
EditorAmerican Institute of Physics
CitaciónPhysical Review B - Condensed Matter and Materials Physics 89: 094401 (2014)
ResumenWe study the zero-temperature phase diagram of two-dimensional hard-core bosons on a square lattice with nearest-neighbor and plaquette (ring-exchange) hoppings, at arbitrary densities, by means of a hierarchical mean-field theory. In the frustrated regime, where quantum Monte Carlo suffers from a sign problem, we find a rich phase diagram where exotic states with nonzero chirality emerge. Among them, novel insulating phases, characterized by nonzero bond-chirality and plaquette order, are found over a large region of the parameter space. In the unfrustrated regime, the hierarchical mean-field approach improves over the standard mean-field treatment as it is able to capture the transition from a superfluid to a valence bond state upon increasing the strength of the ring-exchange term, in qualitative agreement with quantum Monte Carlo results. © 2014 American Physical Society.
Descripción17 págs. ; 16 figs. ; 2 apps. ; PACS number(s): 05.30.Jp, 75.10.Jm, 64.70.Tg
Identificadoresdoi: 10.1103/PhysRevB.89.094401
issn: 1098-0121
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