Quantum oscillations in helicon attenuation

The effect of the periodic potential on helicon attenuation is calculated using the effective-mass approximation. Above the Doppler-shifted cyclotron resonance large quantum oscillations arise from Δn=0 transitions which have nonvanishing matrix elements only for tilted orbits in real space. A comparison of the model with recent experiments on quantum oscillations in metals is discussed. © 1967 The American Physical Society.