Direct Measurement of the g-Factor of Composite Fermions

Abstract

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.

arXiv comment4 pages, 4 figures Changed content: Fokus more on g-factors (and less on other details)

References in corpus (6)

• Singularities in the Fermi liquid description of a partially filled Landau level and the energy gaps of fractional quantum Hall states
• Fermionic Chern-Simons theory for the Fractional Quantum Hall Effect in Bilayers
• A Composite Fermion Hofstader Problem: Partially Polarized Density Wave States in the 2/5 FQHE
• Theory of the Half-Polarized Quantum Hall States
• Spin-pairing instabilities at the coincidence of two Landau levels
• Testing the Landau Fermi liquid description of the fractional quantum Hall effect

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• Absorption in the fractional quantum Hall regime: trion dichroism and spin polarization
• Filling factor dependence of the fractional quantum Hall effect gap
• Signatures of spin in the n=1/3 Fractional Quantum Hall Effect
• Acoustic Studies of AC Conductivity Mechanisms in $n$-GaAs/AlGaAs in the Integer and Fractional Quantum Hall Effect Regime
• Electron conductivity and second generation Composite Fermions
• Phonon Excitations of Composite Fermion Landau Levels
• Surface Acoustic Waves Probe of the Spin Phase Transition at $\nu$=2/3 in n-GaAs/AlGaAs structure