On the evaluation of the specific heat and general off-diagonal n-point correlation functions within the loop algorithm

Details On the evaluation of the specific heat and general off-diagonal n-point correlation functions within the loop algorithm On the evaluation of the specific heat and general off-diagonal n-point correlation functions within the loop algorithm

2000-02-09

arxiv.org/abs/cond-mat/0002131v2

Euro. Phys. J. B, Vol. 15, 641 (2000).

Physics

Condensed Matter

For publication EPJ B

Scientific paper

10.1007/s100510051167

We present an efficient way to compute diagonal and off-diagonal n-point correlation functions for quantum spin-systems within the loop algorithm. We show that the general rules for the evaluation of these correlation functions take an especially simple form within the framework of directed loops. These rules state that contributing loops have to close coherently. As an application we evaluate the specific heat for the case of spin chains and ladders.

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