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Title: Extended quantum dimer model and novel valence-bond phases
Authors: Nakata, Kouki
Totsuka, Keisuke  kyouindb  KAKEN_id
Author's alias: 仲田, 光樹
Keywords: dimers (theory)
phase diagrams (theory)
quantum phase transitions (theory)
Issue Date: Jan-2011
Publisher: IOP Publishing Ltd and SISSA
Journal title: Journal of Statistical Mechanics: Theory and Experiment
Volume: 2011
Issue: 01
Thesis number: P01033
Abstract: We extend the quantum dimer model (QDM) introduced by Rokhsar and Kivelson so as to construct a concrete example of the model which exhibits the first-order phase transition between different valence-bond solids suggested recently by Batista and Trugman and look for the possibility of other exotic dimer states. We show that our model contains three exotic valence-bond phases (herringbone, checkerboard and dimer smectic) in the ground-state phase diagram and that it realizes the phase transition from the staggered valence-bond solid to the herringbone. The checkerboard phase has four-fold rotational symmetry, while the dimer smectic, in the absence of quantum fluctuations, has massive degeneracy originating from partial ordering only in one of the two spatial directions. A resonance process involving three dimers resolves this massive degeneracy and the dimer smectic becomes ordered (order from disorder).
Rights: © IOP Publishing 2011
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1088/1742-5468/2011/01/P01033
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