Using an improved version of the projection quantum Monte Carlo technique, we study the square-lattice Hubbard model with nearest-neighbor hopping t and next-nearest-neighbor hopping t' by simulation of lattices with up to 20 x 20 sites. For a given R = 2t'/t, we consider that filling which leads to a singular density of states of the noninteracting problem. For repulsive interactions, we find an itinerant ferromagnet (antiferromagnet) for R = 0.94 (R = 0.2). This is consistent with the prediction of the T-matrix approximation, which sums the most singular set of diagrams.

Ferromagnetism in the two dimensional t-t' Hubbard model at the VanHove density / Hlubina, R; Sorella, Sandro; Guinea, F.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 78:7(1997), pp. 1343-1346. [10.1103/PhysRevLett.78.1343]

Ferromagnetism in the two dimensional t-t' Hubbard model at the VanHove density

Sorella, Sandro;
1997-01-01

Abstract

Using an improved version of the projection quantum Monte Carlo technique, we study the square-lattice Hubbard model with nearest-neighbor hopping t and next-nearest-neighbor hopping t' by simulation of lattices with up to 20 x 20 sites. For a given R = 2t'/t, we consider that filling which leads to a singular density of states of the noninteracting problem. For repulsive interactions, we find an itinerant ferromagnet (antiferromagnet) for R = 0.94 (R = 0.2). This is consistent with the prediction of the T-matrix approximation, which sums the most singular set of diagrams.
1997
78
7
1343
1346
https://doi.org/10.1103/PhysRevLett.78.1343
https://arxiv.org/abs/cond-mat/9609253
Hlubina, R; Sorella, Sandro; Guinea, F.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/13578
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