### 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 language | English (US) |
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Article number | 23378 |

Pages (from-to) | 2715-2722 |

Number of pages | 8 |

Journal | Physics Letters, Section A: General, Atomic and Solid State Physics |

Volume | 379 |

Issue number | 42 |

DOIs | |

State | Published - Oct 30 2015 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

**Phase diagram of strongly attractive p-orbital fermions on optical lattices.** / DeSilva, Theja Nilantha.

Research output: Contribution to journal › Article

*Physics Letters, Section A: General, Atomic and Solid State Physics*, vol. 379, no. 42, 23378, pp. 2715-2722. https://doi.org/10.1016/j.physleta.2015.08.019

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TY - JOUR

T1 - Phase diagram of strongly attractive p-orbital fermions on optical lattices

AU - DeSilva, Theja Nilantha

PY - 2015/10/30

Y1 - 2015/10/30

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84941806449&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84941806449&partnerID=8YFLogxK

U2 - 10.1016/j.physleta.2015.08.019

DO - 10.1016/j.physleta.2015.08.019

M3 - Article

AN - SCOPUS:84941806449

VL - 379

SP - 2715

EP - 2722

JO - Physics Letters, Section A: General, Atomic and Solid State Physics

JF - Physics Letters, Section A: General, Atomic and Solid State Physics

SN - 0375-9601

IS - 42

M1 - 23378

ER -