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Modulation of charge-density waves by superlattice structures

Authors
  • Malvezzi, Andre L
  • Paiva, Thereza
  • Santos, Raimundo R dos
Type
Published Article
Publication Date
Apr 21, 2006
Submission Date
Apr 21, 2006
Identifiers
DOI: 10.1103/PhysRevB.73.193407
arXiv ID: cond-mat/0604523
Source
arXiv
License
Unknown
External links

Abstract

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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