Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-02-17
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages TeX
Scientific paper
The quantum Hall effect in ultra-high mobility GaAs/AlGaAs has been measured and plateaus are found at many different fractions. The resistivity is quantized as \rho =h/ie^2 where i exhibits many different values. The fractions 5/3, 8/5, 11/7, 14/9, 17/11 fit the formula, i=3p\pm 2/(2p \pm 1) and it is claimed that 2p flux quanta are attached to the electron. The fractions 4/11, 7/11, 12/7, 13/8 and 15/11 do not fit the expression for i, even then the authors insist that flux quanta are attached to the electron and hence composite fermions (CF) are formed. We report that the interpretation of the experimental data in terms of CF is incorrect.
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