We report distinct nonanalytic signatures in the spin-orbit entanglement of a 2D electron gas with Rashba interactions at integer values of the filling factor and at certain level crossings. The accompanying sharp changes in the bulk spin-orbit entanglement entropy can be probed by measuring the fluctuation in the transverse spin polarization of the electron gas.
@article{arxiv.1601.07611,
title = {Integer effects in the entanglement and spin fluctuations of a quantum Hall system with Rashba interactions},
author = {Rona F. Barbarona and Francis N. C. Paraan},
journal= {arXiv preprint arXiv:1601.07611},
year = {2016}
}