Next Nearest-Neighbor Correlation Functions of the Spin-1/2 XXZ Chain at Massive Region
arXiv:cond-mat/0308589 · doi:10.1143/JPSJ.73.245
Abstract
The second neighbor correlation functions of the spin-${1/2}$ $XXZ$ chain in the ground state are expressed in the form of three dimensional integrals. We show that these integrals can be reduced to one-dimensional ones and thereby evaluate the values of the next nearest-neighbor correlation functions for ${Î>1}$.
12 pages, 1 figure