Hole Propagation in a 2D Quantum Spin-1/2 Antiferromagnet. II. Effect of Finite J Correction

Abstract

Single hole propagation doped into a quantum antiferromagnet is studied taking into account the effect of finite exchange interaction up to the first order among antiferromagnetic spin background. Both even and odd moments of the hole density of states are evaluated. The results of the lower order moments suggest the existence of the string effect, which favors the hole localization in the small concentration region.