Fractional quantum hall effect around =32: Composite fermions with a spin

Angular dependent magnetotransport measurements on the fractional quantum Hall (FQHE) states around Landau level filling factor =32 are explained very effectively in terms of composite fermions (CFs) with a spin. The disappearance and reappearance of FQHE states as well as their spin polarization is deduced from a simple "Landau level" fan diagram for CFs. While the "Landau splitting" scales with effective magnetic field, with its origin at =32, the spin-splitting scales with total external magnetic field having its origin at B=0. The g factor of a CF is largely the g factor of the electron.