Staggered flux and stripes in doped antiferromagnets

Details Staggered flux and stripes in doped antiferromagnets Staggered flux and stripes in doped antiferromagnets

2002-03-23

arxiv.org/abs/cond-mat/0203485v1

Physics

Condensed Matter

Strongly Correlated Electrons

RevTex, 19 pages including 20 figures

Scientific paper

10.1103/PhysRevB.67.014403

We have numerically investigated whether or not a mean-field theory of spin textures generate fictitious flux in the doped two dimensional $t-J$-model. First we consider the properties of uniform systems and then we extend the investigation to include models of striped phases where a fictitious flux is generated in the domain wall providing a possible source for lowering the kinetic energy of the holes. We have compared the energetics of uniform systems with stripes directed along the (10)- and (11)-directions of the lattice, finding that phase-separation generically turns out to be energetically favorable. In addition to the numerical calculations, we present topological arguments relating flux and staggered flux to geometric properties of the spin texture. The calculation is based on a projection of the electron operators of the $t-J$ model into a spin texture with spinless fermions.

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