Submillimetre cyclotron resonance of electrons in GaP

Abstract The first observation of cyclotron resonance in n -type GaP is reported. The electrons were thermally excited at a temperature of 100 K and the resonance was observed at submillimetre wavelengths (337 μm) using a pulsed magnetic field of 0–300 kG. From experiments with B ∥〈100〉, 〈110〉 and 〈111〉 it was found that the transverse effective mass for electrons is m ∗ ⊥ = 0.25 ± 0.01 m 0 and that the anisotropy factor for the conduction band ellipsoids is K = 20 +10 -6 .