Fractional quantum Hall effect without energy gap

Details Fractional quantum Hall effect without energy gap Fractional quantum Hall effect without energy gap

2006-03-31

arxiv.org/abs/cond-mat/0603835v1

Pis'ma v ZhETF, vol. 86, 148 (2007) [ JETP Lett., Vol. 86, 139 (2007) ]

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1134/S0021364007140159

In the fractional quantum Hall effect regime we measure diagonal ($\rho_{xx}$) and Hall ($\rho_{xy}$) magnetoresistivity tensor components of two-dimensional electron system (2DES) in gated GaAs/Al$_{x}$Ga$_{1-x}$As 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 manifesting complete suppression of the quasiparticle energy gaps.

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