Site occupation constraints in mean-field approaches of quantum spin systems at finite temperature

Details Site occupation constraints in mean-field approaches of quantum spin systems at finite temperature Site occupation constraints in mean-field approaches of quantum spin systems at finite temperature

2005-09-28

arxiv.org/abs/cond-mat/0509724v1

Phys.Rev.B 73, 024409 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, 2 figures

Scientific paper

10.1103/PhysRevB.73.024409

We study the effect of site occupation on the description of quantum spin systems at finite temperature and mean-field level. We impose each lattice site to be occupied by a single electron. This is realized by means of a specific prescription. The outcome of the prescription is compared to the result obtained by means of a projection procedure which fixes the site occupation to one particle per site on an average. The comparison is performed for different representations of the Hamiltonian in Fock space leading to different types of mean-field solutions. The behaviour of order parameters is analyzed for each choice of the mean-field and constraint which fixes the occupation rate at each site. Sizable quantitative differences between the outcomes obtained with the two different constraints are observed.

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