Single hole and vortex excitations in the doped Rokhsar-Kivelson quantum dimer model on the triangular lattice

Details Single hole and vortex excitations in the doped Rokhsar-Kivelson quantum dimer model on the triangular lattice Single hole and vortex excitations in the doped Rokhsar-Kivelson quantum dimer model on the triangular lattice

2007-08-03

arxiv.org/abs/0708.0508v2

Phys. Rev. B 76, 172301 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures; minor changes, replaced by published version

Scientific paper

10.1103/PhysRevB.76.172301

We consider the doped Rokhsar-Kivelson quantum dimer model on the triangular lattice with one mobile hole (monomer) at the Rokhsar-Kivelson point. The motion of the hole is described by two branches of excitations: the hole may either move with or without a trapped Z2 vortex (vison). We perform a study of the hole dispersion in the limit where the hole hopping amplitude is much smaller than the interdimer interaction. In this limit, the hole without vison moves freely and has a tight-binding spectrum. On the other hand, the hole with a trapped vison is strongly constrained due to interference effects and can only move via higher-order virtual processes.

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