Enhanced magnetization at integer quantum Hall states

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.


Published in:
Physical Review B, 64, 12
Year:
2001
ISSN:
1095-3795
Laboratories:




 Record created 2015-07-08, last modified 2018-01-28


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