A study of bond-centered stripes as two-leg ladders in an antiferromagnetic environment

Mats Granath

Physics Department, Goteborg University

We study the distribution of low energy electronic spectral weight in a simple model of a hole-doped antiferromagnet with bond-centered stripes. We find that the Fermi surface shows an intriguing similarity to that of underdoped LaSrCuO. Experimentally (ARPES) is found two distinct pieces of Fermi surface in the nodal and anti-nodal regions of the BZ respectively. This distinction is reproduced naturally by the model where the spectral weight in the nodal region comes from the bonding band of the stripes and the weight in the anti-nodal region comes from the anti-bonding band. To address whether this correspondence is deeper than the similarity of the Fermi surfaces we also study a one-dimensional single stripe model with electron-electron and electron-phonon interactions. The model is a Cu-O two-leg ladder in the presence of a staggered potential which simulates the local antiferromagnetic environment of the hole doped stripe. We combine a self-consistent Hartree-Fock treatment with a perturbative RG analysis.