Half-filled stripes in the t-t'-U Hubbard model

Details Half-filled stripes in the t-t'-U Hubbard model Half-filled stripes in the t-t'-U Hubbard model

2005-11-04

arxiv.org/abs/cond-mat/0511100v1

phys. stat. sol. (b) 243, 128 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted for publication in Phys. Stat. Sol

Scientific paper

10.1002/pssb.200562403

Using a self-consistent Hartree-Fock approximation we investigate the relative stability of various stripe phases in the extended $t$-$t'$-$U$ Hubbard model. One finds that a negative ratio of next- to nearest-neighbor hopping $t'/t<0$ expells holes from antiferromagnetic domains and reinforces the stripe order. Therefore the half-filled stripes not only accommodate holes but also redistribute them so that the kinetic energy is gained, and these stripes take over in the regime of $t'/t\simeq -0.3$ appropriate for YBa$_2$Cu$_3$O$_{6+\delta}$.

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