Modulation of charge-density waves by superlattice structures

Details Modulation of charge-density waves by superlattice structures Modulation of charge-density waves by superlattice structures

2006-04-22

arxiv.org/abs/cond-mat/0604523v1

Phys. Rev. B 73, 193407 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, to appear in Phys Rev B

Scientific paper

10.1103/PhysRevB.73.193407

We discuss the interplay between electronic correlations and an underlying superlattice structure in determining the period of charge density waves (CDW's), by considering a one-dimensional Hubbard model with a repeated (non-random) pattern of repulsive (U>0) and free (U=0) sites. Density matrix renormalization group diagonalization of finite systems (up to 120 sites) is used to calculate the charge-density correlation function and structure factor in the ground state. The modulation period can still be predicted through effective Fermi wavevectors, k_F*, and densities, and we have found that it is much more sensitive to electron (or hole) doping, both because of the narrow range of densities needed to go from q*=0 to \pi, but also due to sharp 2k_F*-4k_F* transitions; these features render CDW's more versatile for actual applications in heterostructures than in homogeneous systems.

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