We investigate the far-infrared (FIR) absorption of a two-dimensionalelectron gas in a periodically modulated quantizing magnetic field. Themagnetic field varies along only one spatial direction and the externaltime-dependent electric field is linearly polarized along that axis. The mutualCoulomb interaction of the electrons is treated self-consistently in the groundstate and in the absorption calculation within the Hartree approximation. Theeffects of the magnetic material on top of the heterostructure as a gratingcoupler is included in the time-dependent incident FIR electric field. We showthat similar to an electric modulation, the absorption can be directlycorrelated to the underlying electronic energy bands. In addition, the magneticmodulation leads to absorption spectra with a richer structure due to the quitedifferent static response of the electron density to the modulation.
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