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Hund's rule and metallic ferromagnetism
Probability| Speaker: | Daniel Ueltschi, University of Arizona |
| Location: | 693 Kerr |
| Start time: | Tue, May 17 2005, 3:10PM |
Description
The origin of ferromagnetism in metals is an old question that has not
received
a complete answer to this day. We investigate a model of itinerant electrons
in
two different bands, interacting via Coulomb repulsion and Hund's rule. In
the
case of anisotropic on-site exchange interactions, we prove that ground
states
have macroscopic magnetization, and that there is no energy gap. This is a
joint
work with J. Froehlich.