Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-07-24
Phys. Rev. B 74, 134301 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 8 figures
Scientific paper
10.1103/PhysRevB.74.134301
We report on an exhaustive investigation of the dynamical dimer-dimer correlations in imaginary time for the quantum dimer model on the triangular lattice using the Green's function Monte Carlo method. We show in particular that soft modes develop upon reducing the dimer-dimer repulsion, indicating the presence of a second-order phase transition into an ordered phase with broken translational symmetry. We further investigate the nature of this ordered phase, for which a 12-site unit cell has been previously proposed, with the surprising result that significant Bragg peaks are only present at two of the three high-symmetry points consistent with this unit cell. We attribute the absence of a detectable peak to its small magnitude due to the nearly uniform internal structure of the 12-site crystal cell.
Becca Federico
Ferrero Michel
Ivanov Dmitri
Mila Frédéric
Ralko Arnaud
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