The Mott Metal-Insulator transition in the half-filled Hubbard model on the Triangular Lattice

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dc.creatorCapone, Massimo
dc.creatorCapriotti, Luca
dc.creatorBecca, Federico
dc.creatorCaprara, Sergio
dc.date2000-06-28
dc.date.accessioned2026-07-07T08:22:22Z
dc.date.available2026-07-07T08:22:22Z
dc.descriptionWe investigate the metal-insulator transition in the half-filled Hubbard model on a two-dimensional triangular lattice using both the Kotliar-Ruckenstein slave-boson technique, and exact numerical diagonalization of finite clusters. Contrary to the case of the square lattice, where the perfect nesting of the Fermi surface leads to a metal-insulator transition at arbitrarily small values of U, always accompanied by antiferromagnetic ordering, on the triangular lattice, due to the lack of perfect nesting, the transition takes place at a finite value of U, and frustration induces a non-trivial competition among different magnetic phases. Indeed, within the mean-field approximation in the slave-boson approach, as the interaction grows the paramagnetic metal turns into a metallic phase with incommensurate spiral ordering. Increasing further the interaction, a linear spin-density-wave is stabilized, and finally for strong coupling the latter phase undergoes a first-order transition towards an antiferromagnetic insulator. No trace of the intermediate phases is instead seen in the exact diagonalization results, indicating a transition between a paramagnetic metal and an antiferromagnetic insulator.
dc.description5 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0006437
dc.identifierhttp://arxiv.org/abs/cond-mat/0006437
dc.identifierPhys. Rev. B 63, 085104 (2001).
dc.identifierdoi:10.1103/PhysRevB.63.085104
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/135632
dc.subjectStrongly Correlated Electrons
dc.titleThe Mott Metal-Insulator transition in the half-filled Hubbard model on the Triangular Lattice
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