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This Week at Physics

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Event Number 2311

  Monday, September 26th, 2011

Condensed Matter Theory Group Seminar
Orbital ice: an exact Coulomb phase on diamond lattice
Time: 4:30 pm
Place: 5310 Chamberlin
Speaker: Gia-Wei Chern, UW-Madison
Abstract: I will talk about an exact orbital Coulomb phase which is an exact ground state of p-orbital exchange Hamiltonian on the diamond lattice. The Coulomb phase is an emergent state characterized by algebraic dipolar-like correlations and a gauge structure resulting from the local constraints (ice rules) of the underlying lattice models. For most ice models on the pyrochlore lattice, these local constraints are a direct consequence of minimizing the energy of each individual tetrahedron. On the contrary, the orbital ice rules are emergent properties arising from the quantum orbital dynamics. We show that there exists a one-to-one mapping between the orbital-ice states and the spin-ice states obeying the 2-in-2-out constraints on the pyrochlore lattice. We also discuss possible realization of the orbital ice model in optical lattices with p-band fermionic cold atoms.
Host: Perkins
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