Abstract
Recent investigations in the context of the standard and extended t-J models using computational techniques are here described. In regimes of couplings producing a one-hole dispersion compatible with photoemission data for the parent insulator, the one-hole states have strong antiferromagnetic correlations across-the-hole, particularly at momenta (0,π)-(π,0). This effect is rationalized as a tendency toward spin-charge separation in two-dimensions at short distances. At finite hole density, doped stripes are observed. The elementary building block of the stripes resembles the spin arrangement around individual holes. This suggests that the seed of doped stripes already exist in the unusual properties of the insulating parent compound. Stripes are conjectured to originate in a "frustrated spin-charge separation" effect, different from other theories valid at large J/t discussed in previous literature.
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