University
of Toronto
Physics Department
Condensed Matter and Quantum Optics
MONDAY SEMINAR
University
of Toronto
| Speaker : | Dr. Dmitri Ivanov
PSI, Switzerland |
| Topic : | Topological order in resonating-valence-bond liquids and the Rokhsar-Kivelson dimer model on the triangular lattice |
| Time : | Monday, January 13, 2003 at 12:00 noon |
| Place : | Room MP408, Burton Tower, 60 St. George Street / 255 Huron Street |
Abstract
Resonating valence bond (RVB) liquid is a phase of
two-dimensional spin-1/2 systems characterized by
fractional excitations (elementary excitations
carry spin 1/2) and by degeneracy of the ground state
on multiply connected domains ("topological order").
The same structure of topological order appears
in dimer models. I will discuss general properties
of the topological order in RVB liquids and illustrate
them with the particular example of the Rokhsar-Kivelson
dimer model on the triangular lattice. This dimer model
exhibits RVB-liquid properties, and the topological order
of its ground state may be studied by exact analytical methods.
Local Host: Allan Griffin
(416-978-5199) 