Correlated States of Degenerate 2D Electrons Studied by Optical Spectroscopy
The interaction between 2D electrons and a photoexcited hole is of fundamental importance in determining the photoluminescence spectrum in the fractional quantum Hall regime. We present new measurements on a low-density electron system which reveal a distinct Fermi edge singularity at zero and low magnetic fields, indicating dynamical response of the Fermi sea to the presence of the hole. The photoluminescence intensity from this system is very sensitive to the effects of electron correlation, and hierarchies of FQH states are clearly identified. The photoluminescence energy, however, is quite insensitive to electron ground state in the FQH regime.
KeywordsIntensity Modulation Landau Level Electron Ground State Magnetic Field Dependence Fractional Filling
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