Metal-Insulator transition in one-dimensional Hubbard superlattices

Details Metal-Insulator transition in one-dimensional Hubbard superlattices Metal-Insulator transition in one-dimensional Hubbard superlattices

1998-07-22

arxiv.org/abs/cond-mat/9807302v1

Phys. Rev B 58, 9607 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 colour figures; Phys Rev B 15 Sept (tent)

Scientific paper

10.1103/PhysRevB.58.9607

We study the Metal-Insulator transition in one-dimensional Hubbard superlattices (SL's), modelled by a repeated pattern of repulsive (i.e., positive on-site coupling) and free sites. The evolution of the local moment and of the charge gap (calculated from Lanczos diagonalization of chains up to 18 sites), together with a strong coupling analysis, show that the electron density at which the system is insulating increases with the size of the free layer, relative to the repulsive one. In the insulating state, the mechanism of interaction between fermions separated by a free layer is the analog of superexchange, and the charge gap display universal features.

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