Fragmentation of bands and the Fermi surfaces in stripe phases

Details Fragmentation of bands and the Fermi surfaces in stripe phases Fragmentation of bands and the Fermi surfaces in stripe phases

2004-07-29

arxiv.org/abs/cond-mat/0407767v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 4 figures

Scientific paper

10.1209/epl/i2004-10352-9

The mean-field study of the stripe phases of t-t'-U Hubbard model confirms formation of the "impurity" subbands of states localized on domain walls. For bond-aligned stripes it is shown that segments of the Fermi surfaces (FS) in antinodal and nodal directions correspond to the "impurity" band or to that delocalized over a whole antiferromagnet domain. This might explain the dichotomy between corresponding quasiparticles in La_{2-x}Sr_xCuO_4. The Fermi surface changes its topology at some doping depending on stripe width. Additional ordering at the domain walls should be supposed to accord the observed 1/8 anomaly and the stripe spacing. It is confirmed also that the diagonal stripes can provide the dielectric state at nonzero doping.

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