Meinel, I. and Grundler, D. and Heitmann, Detlef and Manolescu, Andrei and Gudmundsson, V. and Wegscheider, Werner and Bichler, Max
Enhanced magnetization at integer quantum Hall states.
Physical Review B 64 (12), 121306R.
We report on enhancements in the magnetization of two-dimensional electron systems in the quantum Hall regime. The observed discontinuities in the magnetization exceed the predictions for interacting electrons calculated in the Hartree-Fock approximation where only the exchange enhancement of the energy gaps is taken into account. We attribute the further enhancement to many-body correlation effects, i.e., filling factor dependent screening within the screened Hartree-Fock approximation. With this, the discontinuities in the magnetization no longer reflect the discontinuities of the chemical potential, but its behavior in the vicinity of integer filling factors.