Abstract
A spectral profile of a Fano resonance for a quasi-two-dimensional magnetoexciton in a quantum well is investigated based on the three-channel Landau-Zener model. It is found that both the Coulomb coupling and the hole-subband mixing have a lot of effects on the line-profile. The former coupling is responsible for a prominent asymmetric profile, having a peak-and-dip structure characteristic of the Fano resonance, whereas the latter one blurs the asymmetry and eventually smears the peak-and-dip structure. Such behavior is analyzed in terms of the multi-channel resonant scattering theory. The stronger either the Coulomb coupling or the hole-subband mixing is, the broader the spectral width becomes. Moreover, the asymmetric profile vanishes with increasing strength of an applied magnetic field, and it is restored, however, as the Coulomb coupling becomes stronger.
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