Direct Measurement of the g-Factor of Composite Fermions
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The activation gap $Δ$ of the fractional quantum Hall states at constant fillings $ν=2/3$ and 2/5 has been measured as a function of the perpendicular magnetic field $B$. A linear dependence of $Δ$ 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.
4 pages, 4 figures Changed content: Fokus more on g-factors (and less on other details)
4 pages, 4 figures Changed content: Fokus more on g-factors (and less on other details)