Cyclotron resonance of ultrashort-period lateral superlattices

The cyclotron resonance of laterally modulated two-dimensional electron systems grown on (775)B-oriented GaAs substrates is measured. The lateral period of this structure is ultrashort, 12 nm. Observed cyclotron resonance spectra show the anticrossing behavior or more complicated behavior. It is found that the behavior cannot be explained by the Landau bands formation and the resonant subband-Landau level coupling that is induced by the potential modulation. A possible explanation for the behavior is the effect of electron–electron interactions introduced by breakdown of translational invariance.