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Next Nearest-Neighbor Correlation Functions of the Spin-1/2 XXZ Chain at Massive Region

Minoru Takahashi, Go Kato, Masahiro Shiroishi

cond-mat.stat-mecharXiv:cond-mat/0308589

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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