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VOLUME 92 (2010) | ISSUE 1 | PAGE 69
Local investigation of the energy gap within the incompressible strip in the quantum Hall regime
We experimentally study the energy gap within the incompressible strip at local filling factor νc=1 at the quantum Hall edge for samples of very different mobilities. The obtained results indicate strong enhancement of the energy gap in comparison to the single-particle Zeeman splitting. We identify the measured gap as a mobility gap, so a pronounced experimental in-plane magnetic field dependence can both be attributed to the spin effects as well as to the change in the energy levels broadening.