Vison excitations in near-critical quantum dimer models

Details Vison excitations in near-critical quantum dimer models Vison excitations in near-critical quantum dimer models

2010-09-06

arxiv.org/abs/1009.1040v2

Europhys. Lett. 94, 57003 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 2 figures, minor corrections corresponding to the published version

Scientific paper

10.1209/0295-5075/94/57003

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.

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