Next Nearest-Neighbor Correlation Functions of the Spin-1/2 XXZ Chain at Massive Region
Minoru Takahashi, Go Kato, Masahiro Shiroishi
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 Δ>1.
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