A note on the high temperature expansion of the density matrix for the isotropic Heisenberg chain

Details A note on the high temperature expansion of the density matrix for the isotropic Heisenberg chain A note on the high temperature expansion of the density matrix for the isotropic Heisenberg chain

2006-11-17

arxiv.org/abs/cond-mat/0611454v1

Physica A377:95-101,2007

Physics

Condensed Matter

Statistical Mechanics

14 pages, 5 figures, to appear in Physica A

Scientific paper

10.1016/j.physa.2006.11.018

G\"ohmann, Kl\"umper and Seel derived the multiple integral formula of the density matrix of the $XXZ$ Heisenberg chain at finite temperatures. We have applied the high temperature expansion (HTE) method to isotropic case of their formula in a finite magnetic field and obtained coefficients for several short-range correlation functions. For example, we have succeeded to obtain the coefficients of the HTE of the 3rd neighbor correlation function $<\sigma_{j}^{z}\sigma_{j+3}^{z}>$ for zero magnetic field up to the order of 25. These results expand our previous results on the emptiness formation probability [Z.Tsuboi, M.Shiroishi, J. Phys.A: Math. Gen. 38(2005) L363; cond-mat/0502569] to more general correlation functions.

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