Optically detected cyclotron resonance in a GaAs/Ga0.67Al0.33As superlattice

Cyclotron resonance has been optically detected in a GaAs/${\mathrm{Ga}}_{0.67}$ ${\mathrm{Al}}_{0.33}$As superlattice with the wells doped with Si to 6×${10}^{16}$ ${\mathrm{cm}}^{\mathrm{-}3}$. The sign and magnitude of the signal depend on the emission monitored, and an effective mass of 0.062$m_0$ was obtained for the electrons. Because of the low magnetic field needed at 22 GHz for cyclotron resonance, the confinement of the orbits is readily observed.