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Condensed Matter Seminars
| Condensed Matter
Thursday, February 25, 2010
Physics Building, Room 204
Note special time.
Note special room.
[Host: Israel Klich ]
Washington University at St. Luis
"Orbital orders and orbital order driven quantum criticality"
I will briefly review the rudiments of orbital order physics and then
discuss several more recent results. Orbitals are described by SU(2)
operators but unlike spins the orbitals live in real space and thus their
interactions are highly frustrated. It will be shown that spatial orders
of electronic orbital states in a crystal can be triggered by thermal
fluctuations alone (contrary to earlier lore, no zero point quantum
fluctuations are necessary to stabilize orders). It will be further shown
how symmetry considerations alone give rise to dimensional reduction as
well as topological order and selection rules that may be experimentally
tested from scattering measurements. I will illustrate that in addition to
charge and spin order driven quantum critical points, Orbital Order Driven
Quantum Criticality, as a matter of principle, also occur in the simplest
orbital Hamiltonians. New predicted orbital nematic orders will
be demonstrated in some of the best known orbital
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