Hard-core bosons on the kagome lattice: valence-bond solids and their quantum melting |
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Authors: | Isakov S V Wessel S Melko R G Sengupta K Kim Yong Baek |
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Institution: | Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada. |
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Abstract: | Using large scale quantum Monte Carlo simulations and dual vortex theory, we analyze the ground state phase diagram of hard-core bosons on the kagome lattice with nearest-neighbor repulsion. In contrast with the case of a triangular lattice, no supersolid emerges for strong interactions. While a uniform superfluid prevails at half filling, two novel solid phases emerge at densities rho=1/3 and rho=2/3. These solids exhibit an only partial ordering of the bosonic density, allowing for local resonances on a subset of hexagons of the kagome lattice. We provide evidence for a weakly first-order phase transition at the quantum melting point between these solid phases and the superfluid. |
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