Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”

TT 24.22: Poster

Mittwoch, 10. März 2004, 14:30–19:00, Poster A

Incommensurate charge-density wave in the stripe phase of the two-dimensional Hubbard-Holstein model — •Serguei Varlamov and Götz Seibold — Institut für Physik, BTU Cottbus, PBox 101344, 03013 Cottbus, Germany

We investigate the structure of the stripe phase in the two-dimensional infinite-U Hubbard-Holstein model by means of the slave-boson technique. We find in the mean-field approximation that the incommensurate charge density waves (ICDW) appear in the region of the g vs δ phase diagram where an ICDW is expected to form in the frustrated phase-separation scenario. Our main finding is that due to the competition between strong on-site correlations and CDW ordering instability the incommensurability of CDW depends from the number of carriers leading to the reduction of the incommensurability with increasing of hole doping. The influence of long-range Coulomb interaction on the structure of ICDW is discussed.