An Anderson-Fano Resonance and Shake-Up Processes in the   Magneto-Photoluminescence of a Two-Dimensional Electron System
  We report an anomalous doublet structure and low-energy satellite in the magneto-photoluminescence spectra of a two-dimensional electron system. The doublet structure moves to higher energy with increasing magnetic field and is most prominent at odd filling factors 5 and 3. The lower-energy satellite peak tunes to lower energy for increasing magnetic field between filling factor 6 and 2. These features occur at energies below the fundamental band of recombination originating from the lowest Landau level and display striking magnetic field and temperature dependence that indicates a many-body origin. Drawing on a recent theoretical description of Hawrylak and Potemski, we show that distinct mechanisms are responsible for each feature. 
M.J. Manfra and B.B. Goldberg (Dept of Physics, Boston University) L.   Pfeiffer and K. West (Bell Laboratories, Lucent Tech...