Correlation functions of the XXZ spin-1/2 chain: recent progress
Correlation functions of the XXZ spin-1/2 chain: recent progress
Correlation functions of the XXZ spin-1/2 chain: recent progress
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J. M. Maillet <strong>Correlation</strong> <strong>functions</strong>withS 0 =+ 1 2∫ ∞−∞∫ ∞−∞dλρ(λ) logdµdλρ(λ)ρ(µ) logand <strong>the</strong> integral equation for <strong>the</strong> density ρ(λ)−∞(sinh(λ − iζ/2) sinh(λ + iζ/2)(cosh 2 πζ λ )sinh 2 πζ(λ − µ)sinh(λ − µ − iζ) sinh(λ − µ + iζ)2π πλtanh − coth(λ − iζ/2) − coth(λ + iζ/2)ζ ζ∫ ∞( 2π= V.P.ζ coth π )ζ (λ − µ) − coth(λ − µ − iζ) − coth(λ − µ + iζ) ρ(µ) dµ)Solution :ρ(λ) =πλcosh2ζζ √ 2 cosh πλζ,– Typeset by FoilTEX – Florence 2003 16