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Condensed Matter Seminars

ics Condensed Matter
Thursday, January 23, 2003
3:30 PM
Physics Building, Room 204
Note special time.
Note special room.
Oleg Tchernyshyov [Host: Paul Fendley]
Johns Hopkins
"Valence bond liquids and solids in geometrically frustrated magnets"
ABSTRACT:
Frustrated magnets are models of strongly interacting systems. Frustration reveals itself through a vast degeneracy of the classical ground state of a magnet and is responsible for a large number of soft modes that destroy magnetic order. Possible alternative phases that could emerge in place of the Neel state are the valence-bond solid, which breaks some lattice symmetry, and the valence-bond liquid, which has no broken symmetries yet differs from a paramagnet by the existence of a hidden topological order. We have recently found examples of valence-bond liquids and solids in a study of almost classical frustrated antiferromagnets on the pyrochlore lattice and its planar analogs.

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