Band-gap optical recombination from the two-dimensional electron gas in GaAs-(Al,Ga)As quantum wells was measured in the regime of the fractional quantum Hall effect. New intrinsic emission lines emerge at the Landau-level filling factor ±1 and at ±<0.8. The anomaly near ±=1 is associated with changes in population of the lowest spin-split Landau level. The spectral doublet observed near ±=23 has a striking temperature dependence below T=2 K similar to the magnetoresistance ±xx associated with the many-body quantum fluid.
ASJC Scopus subject areas
- Physics and Astronomy(all)