Orbital order in Mott insulators of spinless p-band fermions

Details Orbital order in Mott insulators of spinless p-band fermions Orbital order in Mott insulators of spinless p-band fermions

2008-01-03

arxiv.org/abs/0801.0589v2

Phys. Rev. Lett. 100, 160403 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

added references, corrected Fig.3

Scientific paper

10.1103/PhysRevLett.100.160403

A gas of strongly interacting spinless p-orbital fermionic atoms in 2D optical lattices is proposed and studied. Several interesting new features are found. In the Mott limit on a square lattice, the gas is found to be described effectively by an orbital exchange Hamiltonian equivalent to a pseudospin-1/2 XXZ model. For a triangular, honeycomb, or Kagome lattice, the orbital exchange is geometrically frustrated and described by a new quantum 120 degree model. We determine the orbital ordering on the Kagome lattice, and show how orbital wave fluctuations select ground states via the order by disorder mechanism for the honeycomb lattice. We discuss experimental signatures of various orbital ordering.

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