RECOMBINATION RADIATION FROM A 2-DIMENSIONAL ELECTRON-SYSTEM IN A STRONG MAGNETIC-FIELD - SPIN DEPENDENCE

The spin polarization of the ground state of a two-dimensional electron system in a strong magnetic field is shown to have a profound influence on optical transitions. The radiative-recombination lines calculated at a fractional-quantum-Hall state group together according to the spin of the impurity-free state. We expect that, depending upon the magnetic-field strength, the luminescence line should either exhibit splitting or a blueshift, which reflects the ground-state spin configurations. These features are absent for a filling factor where no incompressible state is expected.