Shell-Filling Effect in the Entanglement Entropies of Spinful Fermions
Shell-Filling Effect in the Entanglement Entropies of Spinful Fermions
We consider the von Neumann and R\'enyi entropies of the one dimensional quarter-filled Hubbard model. We observe that for periodic boundary conditions the entropies exhibit an unexpected dependence on system size: for L=4 mod 8 the results are in agreement with expectations based on conformal field theory, while for L=0 …