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A diagrammatic theory of the antiferromagnetic frustrated 2d Heisenberg model

J. Reuther and P. Wölfle

We consider the ground state properties of the two-dimensional spin-1/2 J1-J2-Heisenberg model on a square lattice. Within a diagrammatic formulation in terms of auxiliary fermions we consider two different approximation schemes. First we use a phenomenological assumption on the width of the pseudofermion spectral function to calculate the magnetization and the correlation length within RPA with qualitatively correct results. Secondly we employ a Functional Renormalization Group formulation to obtain quantitative results on the ground state correlations. We discuss two different projection schemes to account for the auxiliary particle constraint.

TitelA diagrammatic theory of the antiferromagnetic frustrated 2d Heisenberg model
VerfasserJ. Reuther and P. Wölfle
VerlagJournal of Physics
ThemaCondensed Matter
Quelle/n
ArtText