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- W2022228601 abstract "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." @default.
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- W2022228601 date "2010-01-01" @default.
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- W2022228601 title "A diagrammatic theory of the antiferromagnetic frustrated 2d Heisenberg model" @default.
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