Vison excitations in near-critical quantum dimer models
Strongly Correlated Electrons
2011-05-31 v2
Abstract
We study vison excitations in a quantum dimer model interpolating between the Rokhsar-Kivelson models on the square and triangular lattices. In the square-lattice case, the model is known to be critical and characterized by U(1) topological quantum numbers. Introducing diagonal dimers brings the model to a Z_2 resonating-valence-bond phase. We study variationally the emergence of vison excitations at low concentration of diagonal dimers, close to the critical point. We find that, in this regime, vison excitations are large in size and their structure resembles vortices in type-II superconductors.
Keywords
Cite
@article{arxiv.1009.1040,
title = {Vison excitations in near-critical quantum dimer models},
author = {Grégory Strübi and Dmitri A. Ivanov},
journal= {arXiv preprint arXiv:1009.1040},
year = {2011}
}
Comments
6 pages, 2 figures, minor corrections corresponding to the published version