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

Research output: Contribution to journalArticle

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

Fingerprint

perturbation theory
fermions
phase diagrams
orbitals
magnons
signatures
interactions
atoms

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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

In: Physics Letters, Section A: General, Atomic and Solid State Physics, Vol. 379, No. 42, 23378, 30.10.2015, p. 2715-2722.

Research output: Contribution to journalArticle

@article{1c5388347e4545d787b8d4a8bac14012,
title = "Phase diagram of strongly attractive p-orbital fermions on optical lattices",
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.",
author = "DeSilva, {Theja Nilantha}",
year = "2015",
month = "10",
day = "30",
doi = "10.1016/j.physleta.2015.08.019",
language = "English (US)",
volume = "379",
pages = "2715--2722",
journal = "Physics Letters, Section A: General, Atomic and Solid State Physics",
issn = "0375-9601",
publisher = "Elsevier",
number = "42",

}

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 -