Dynamic spin correlation functions of the XYZ chain at infinite temperature: A study based on moments

JoséM.R. Roldan, Barry M. McCoy and Jacques H.H. Perk

Physica A: Statistical Mechanics and its Applications, 1986, vol. 136, issue 2, 255-302

Abstract: For infinite temperature we calculate the terms up to order t10 in the expansion of the correlation function 〈σz0(t)σzn(0)〉 of the anisotropic spin - 12 Heisenberg chain. These expansion coefficients are analyzed using the theory of Tchebycheff bounds. For the isotropic Heisenberg chain, where longer series are available, the Tchebycheff bounds are also calculated. These bounds are then used to assess the various phenomenological approximation schemes commonly used to discuss spin diffusion.

Date: 1986
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:136:y:1986:i:2:p:255-302

DOI: 10.1016/0378-4371(86)90254-2

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