Certain lattice structures create conflicting interactions for
spins residing on such a lattice. At the classical level, spin
frustration translates into a large number of degenerate ground
states and to disruption of magnetic order even at low temperatures.
Quantum effects lift the classical degeneracy and may produce a ground
state with interesting properties. I will present the results of our
recent studies of the Heisenberg antiferromagnet on the pyrochlore
lattice and its two-dimensional analogs, where we find ground states
and thermal ensembles with valence-bond order.
Begin WebCam and audio for the whole talk: high bandwidth or medium bandwidth.
Begin QuickTime of the whole talk (high bandwidth).
To begin viewing slides, click on the first slide below. (Or, view as pdf.)