Abstract
From the degree of circular polarization of the time-resolved radiative recombination of 2D electrons with photoexcited holes bound to acceptors we have measured the magnetic field dependencies of the electron spin polarization for various fractional ( , , , , , , , , and ) and composite fermions ( , , and ) states. The Fermi energies of these composite fermion states are measured for the first time and the corresponding value of the composite fermion density of states mass at is found to be about 4 times heavier than the previously reported values of the “activation” mass.
- Received 30 November 1998
DOI:https://doi.org/10.1103/PhysRevLett.82.3665
©1999 American Physical Society