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Formation of clusters in the 2D t − J model: The mechanism for phase separation.

By A. Fledderjohann, A. Langari and K. -h. Mütter

Abstract

Abstract. The emergence of phase separation is investigated in the framework of a 2D t − J model by means of a variational product ansatz, which covers the infinite lattice by two types of L × L clusters. Clusters of the first type are completely occupied with electrons, i.e. they carry maximal charge Qe = L 2 and total spin 0, and thereby form the antiferromagnetic background. Holes occur in the second type of clusters – called “hole clusters”. They carry a charge Qh < L 2. The charge Qh and the number N(Qh) of hole clusters is fixed by minimizing the total energy at given hole density and spin exchange coupling α = J/t. For α not too small (α> 0.5) it turns out that hole clusters are occupied with an even number Qh < L 2 of electrons and carry a total spin 0. For increasing α the charge Qh(α) of the hole clusters decreases. Some points on the boundary curve can be extracted from Qh(α)

Year: 2006
DOI identifier: 10.1088/0953-8984/18/20/017
OAI identifier: oai:CiteSeerX.psu:10.1.1.242.7339
Provided by: CiteSeerX
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