|VOLUME 92 | ISSUE 1 |
Local investigation of the energy gap within the incompressible strip in the quantum Hall regime
E. V. Deviatov, A. Lorke+, G. Biasiol*, L. Sorba, W. Wegscheider
Institute of Solid State Physics RAS, 142432 Chernogolovka, Moscow District, Russia
+Laboratorium für Festkörperphysik, Universität Duisburg-Essen, D-47048 Duisburg, Germany
*Laboratorio TASC, CNR-IOM, Area Science Park, I-34149 Trieste, Italy
NEST, Istituto Nanoscienze and Scuola Normale Superiore, I-56127 Pisa, Italy
Laboratory for Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland
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.
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