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### Event Number 2311

**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- Add this event to your calendar