Interaction-induced adiabatic cooling for antiferromagnetism in optical lattices

Journal Article · Wed Aug 01 04:00:00 EDT 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.76.064402· OSTI ID:21055117

Dare, A -M; Raymond, L; Albinet, G; Tremblay, A.-M. S. ^[1]

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1. L2MP, Universite de Provence, Batiment IRPHE, 49 rue Joliot Curie, BP 146, 13384 Marseille Cedex 13 (France)

In the experimental context of cold-fermion optical lattices, we discuss the possibilities to approach the pseudogap or ordered phases by manipulating the scattering length or the strength of the laser-induced lattice potential. Using the two-particle self-consistent approach, as well as quantum Monte Carlo simulations, we provide isentropic curves for the two- and three-dimensional Hubbard models at half-filling. These quantitative results are important for practical attempts to reach the ordered antiferromagnetic phase in experiments on optical lattices of two-component fermions. We find that adiabatically turning on the interaction in two dimensions to cool the system is not very effective. In three dimensions, adiabatic cooling to the antiferromagnetic phase can be achieved in such a manner, although the cooling efficiency is not as high as initially suggested by dynamical mean-field theory. Adiabatic cooling by turning off the repulsion beginning at strong coupling is possible in certain cases.

• OSTI ID: 21055117
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 6 Vol. 76; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
COMPUTERIZED SIMULATION
COOLING
FERMIONS
HUBBARD MODEL
LASERS
MEAN-FIELD THEORY
MONTE CARLO METHOD
SCATTERING LENGTHS
STRONG-COUPLING MODEL
THREE-DIMENSIONAL CALCULATIONS