Malvezzi, André Luiz [UNESP]Paiva, Therezados Santos, Raimundo R.2014-05-202014-05-202006-05-01Physical Review B. College Pk: Amer Physical Soc, v. 73, n. 19, 4 p., 2006.1098-0121http://hdl.handle.net/11449/38324We 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 (nonrandom) 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 wave vectors 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.4engArtigo10.1103/PhysRevB.73.193407WOS:000237950400031Acesso abertoWOS000237950400031.pdf4459191234201599