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VOLUME 86 (2007) | ISSUE 2 | PAGE 148
Fractional quantum Hall effect at suppressed energy gap
PACS: 73.43.Qt
Abstract
In the fractional quantum Hall effect regime we measure diagonal (ρ xx ) and Hall (ρ xy) magnetoresistivity tensor components of two-dimensional electron system (2DES) in gated GaAs/AlxGa1-xAs heterojunctions, together with capacitance between 2DES and the gate. We observe 1/3- and 2/3-fractional quantum Hall effect at rather low magnetic fields where corresponding fractional minima in the thermodynamical density of states have already disappeared implying suppression of the quasiparticle energy gaps.