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Accueil du site > Publications > Publications 2008 > Generic mixed columnar-plaquette

Generic mixed columnar-plaquette

Arnaud Ralko, Didier Poilblanc and Roderich Moessner

par Arnaud Ralko - 1er janvier 2008

We revisit the phase diagram of Rokhsar-Kivelson models, which are used in fields such as superconductivity, frustrated magnetism, cold bosons, and the physics of Josephson junction arrays. From an extended height effective theory, we show that one of two simple generic phase diagrams contains a mixed phase that interpolates continuously between columnar and plaquette states. For the square lattice quantum dimer model we present evidence from exact diagonalization and Green’s function Monte Carlo techniques that this scenario is realised, by combining an analysis of the excitation gaps of different symmetry sectors with information on plaquette structure factors. This presents a natural framework for resolving the disagreement between previous studies.