Many-electron effects on donor states in a two-dimensional electron gas in a strong magnetic field

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Abstract
The many-electron effects on donor-bound intra- and inter-Landau-level excitation spectrum in a two-dimensional electron gas in a strong magnetic field are investigated. At ν=2 the donor related far infrared (FIR) spectrum shows a blueshift and an additional structure below cyclotron energy. At ν=1 the spin polarized ground state is unstable against the formation of donor bound intra-Landau level spin flip excitations (spin waves). The FIR spectrum of this new ground state is calculated and shown to be distinct from either the paramagnetic (ν=2) or the ferromagnetic (ν=1) ground states. These findings provide a qualitative understanding of recent experiments by Cheng et al.