Doped stripes evolving from the one-hole properties of the antiferromagnetic insulator

Recent investigations in the context of the standard and extended t-J model s using computational techniques are here described. In regimes of coupling s producing a one-hole dispersion compatible with photoemission data for th e parent insulator, the one-hole states have strong antiferromagnetic corre lations across-the-hole, particularly at momenta (0,pi)-(pi ,0). This effec t is rationalized as a tendency toward spin-charge separation in two-dimens ions at short distances. At finite hole density, doped stripes are observed . The elementary building block of the stripes resembles the spin arrangeme nt around individual holes. This suggests that the seed of doped stripes al ready exist in the unusual properties of the insulating parent compound. St ripes are conjectured to originate in a "frustrated spin-charge separation" effect, different from other theories valid at large J/t discussed in prev ious literature.