Systematic Studies of the Fractional Quantum Hall Effect
- 1 January 1987
- journal article
- Published by IOP Publishing in Physica Scripta
- Vol. T19A, 72-78
- https://doi.org/10.1088/0031-8949/1987/t19a/012
Abstract
A description is given of the occurrence of fractional quantum Hall effects, and how these are influenced by the presence of disorder. It is shown that when electrons are photoexcited into a GaAs-GaAlAs heterojunction, the fractional state existing at a Landau level occupancy of 7/5 can dominate over that at 4/3. Activation energy measurements of the resistivity show how the energy gap of the fractional states is reduced by the presence of disorder. A new method of analysis of the resistivity minima is presented which is used to give information on the correlation length of the many body ground state.Keywords
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