Schedule Jun 10, 2004
Quantum magnets with strong frustration.
Oleg Tchernyshyov (Johns Hopkins)

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.

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