SPIN POLARONS IN THE T-J MODEL - SHAPE AND BACKFLOW

The self-consistent Born approximation for the self-energy and the wav e function of a single hole moving in a two-dimensional quantum antife rromagnet is used to calculate various spin-correlation functions that characterize the perturbation induced by the hole. The results for th ese correlation functions agree with the available small-cluster calcu lations. The hole-spin correlation functions decay asymptotically with the distance from the hole as a power law and exhibit a dipolar disto rtion of the antiferromagnet. The quasiparticle spectral weight remain s finite.