Generic mixed columnar-plaquette phases in Rokhsar-Kivelson models

Details Generic mixed columnar-plaquette phases in Rokhsar-Kivelson models Generic mixed columnar-plaquette phases in Rokhsar-Kivelson models

2007-10-05

arxiv.org/abs/0710.1269v1

Phys. Rev. Lett. 100, 037201 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.100.037201

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.

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