Optical properties of a two-dimensional electron gas at even-denominator filling fractions
Abstract
The optical properties of an electron gas in a magnetic field at filling fractions = 1 2m (m=1,2,3...) are investigated using the composite fermion picture. The response of the system to the presence of valence-band holes is calculated. The shapes of the emission spectra are found to differ qualitatively from the well-known electron-hole results at zero magnetic field. In particular, the asymmetry of the emission lineshape is found to be sensitive to the hole-composite fermion plane separation.
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