Charge-density waves in one-dimensional Hubbard superlattices

Details Charge-density waves in one-dimensional Hubbard superlattices Charge-density waves in one-dimensional Hubbard superlattices

2001-09-25

arxiv.org/abs/cond-mat/0109467v1

Phys. Rev. B 65, 153101 (2002).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.65.153101

We study the formation of charge density waves (CDW's) in one-dimensional Hubbard superlattices, modeled by a repeated pattern of repulsive (U>0) and free (U=0) sites. By means of Lanczos diagonalizations for the ground state, we calculate the charge structure factor. Our results show that while the superlattice structure affects the modulation of the charge density waves, the periodicity can still be predicted through an effective density. We also show that, for a fixed repulsive layer thickness, the periodicity of the CDW is an oscillatory function of the free layer thickness.

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