Tuning Kinetic Magnetism of Strongly Correlated Electrons via Staggered Flux

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We explore the kinetic magnetism of the infinite-$U$ repulsive Hubbard models at low hole densities on various lattices with nearest-neighbor hopping integrals modulated by a staggered magnetic flux $\pmϕ$. Tuning $ϕ$ from 0 to $π$ makes the ground state (GS) change from a Nagaoka-type ferromagnetic state to a Haerter-Shastry-type antiferromagnetic state at a critical $ϕ_c$, with both states being of kinetic origin. Intra-plaquette spin correlation, as well as the GS energy, signals such a quantum criticality. This tunable kinetic magnetism is generic, and appears in chains, ladders and two-dimensional lattices with squares or triangles as elementary constituents.
4 pages, 5 figures, 1 table

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Strongly Correlated Electrons, Statistical Mechanics

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http://salesiana.dossiersoluciones.com/handle/123456789/153998

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0706.4423
 http://arxiv.org/abs/0706.4423
 Phys. Rev. Lett. 100, 037202 (2008)
 doi:10.1103/PhysRevLett.100.037202

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arXiv