Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 24: Correlated Electrons: Low-dimensional Systems - Models
TT 24.18: Talk
Wednesday, February 27, 2008, 18:45–19:00, H 2053
Single hole and vortex excitations in the doped Rokhsar-Kivelson quantum dimer model on the triangular lattice — •Hugo Ribeiro1,2, Samuel Bieri2, and Dmitri Ivanov2 — 1Institute of theoretical physics C, RWTH Aachen, Germany — 2Institute of theoretical physics, EPF Lausanne, Switzerland
We consider the doped Rokhsar-Kivelson quantum dimer model on the triangular lattice with one mobile hole (monomer) at the RK 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 inter-dimer 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.