Direct Measurement of the g-Factor of Composite Fermions

F. Schulze-Wischeler, E. Mariani, F. Hohls, R. J. Haug

Published 2003-09-22, updated 2003-10-10Version 2

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.