Topological entropy of realistic quantum Hall wave functions

Abstract

The entanglement entropy of the incompressible states of a realistic quantum Hall system is studied by direct diagonalization. The subdominant term to the area law, the topological entanglement entropy (which is believed to carry information about topologic order in the ground state), was extracted for filling factors $\ensuremath{\nu}=1/3$, $\ensuremath{\nu}=1/5$, and $\ensuremath{\nu}=5/2$. The results for $\ensuremath{\nu}=1/3$ and $\ensuremath{\nu}=1/5$ are consistent with the topological entanglement entropy for the Laughlin wave function. The $\ensuremath{\nu}=5/2$ state exhibits a topological entanglement entropy consistent with the Moore-Read wave function.