Direct measurement of the g factor of composite fermions.
The activation gap Delta of the fractional quantum Hall states at constant fillings nu=2/3 and 2/5 has been measured as a function of the perpendicular magnetic field B. A linear dependence of Delta on B is observed while approaching the spin-polarization transition. This feature allows a direct measurement of the g factor of composite fermions which appears to be heavily renormalized by interactions and strongly sensitive to the electronic filling factor.
Schulze-Wischeler
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F
Institut für Festkörperphysik, Universität Hannover, Germany.
Mariani
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E
Hohls
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F
Haug
R J
RJ