# Numerical treatment of spin systems with unrestricted spin length S : A functional renormalization group study

@article{Baez2017NumericalTO,
title={Numerical treatment of spin systems with unrestricted spin length S : A functional renormalization group study},
author={Maria Laura Baez and Johannes Reuther},
journal={Physical Review B},
year={2017},
volume={96}
}
• Published 15 December 2016
• Physics
• Physical Review B
We develop a generalized pseudo-fermion functional renormalization group (PFFRG) approach that can be applied to arbitrary Heisenberg models with spins ranging from the quantum case $S=1/2$ to the classical limit $S\rightarrow\infty$. Within this framework, spins of magnitude $S$ are realized by implementing $M=2S$ copies of spin-1/2 degrees of freedom on each lattice site. We confirm that even without explicitly projecting onto the highest spin sector of the Hilbert space, ground states tend…

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