Shake-up processes in intersubband magneto-photoabsorption of a two-dimensional electron gas

I theoretically study shake-up processes in photoabsorption of an interacting low-density two-dimensional electron gas (2DEG) in magnetic fields. Such processes, in which an incident photon creates an electron–hole pair and simultaneously excites one electron to one of the higher Landau levels, were observed experimentally [Phys. Rev. Lett. 79 (1997) 3974] and were called combined exciton-cyclotron resonance (ExCR). The recently developed theory of ExCR [Phys. Rev. B 64 (2001) 241101] allows for a consistent treatment of the Coulomb correlations, establishes the exact ExCR selection rules, and predicts the high-field features of ExCR. In this work, I generalize the existing theory of high-field ExCR in the 2DEG to the case when the hole is excited to higher hole Landau levels.