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}
}
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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