Phase diagram of strongly attractive p-orbital fermions on optical lattices

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Abstract

We examine a system of doubly degenerate p-orbital polarized fermions on a two-dimensional square lattice with a strong on-site interaction. We consider the system density at the half filling limit and tackle the strong attractive interaction using a perturbation theory. We treat the four-site square plaquette interaction term generated from the directional tunneling dependence of p-orbitals using the fourth order in perturbation theory. We map the strong coupling particle Hamiltonian into an effective spin-Hamiltonian and then use a variational mean field approach and a linear spin-wave theory to study the phase diagram. Further, we discuss the experimental signatures of these phases within the context of current cold-atom experimental techniques.

Original languageEnglish (US)
Article number23378
Pages (from-to)2715-2722
Number of pages8
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Volume379
Issue number42
DOIs
StatePublished - Oct 30 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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