Doppler-shifted cyclotron resonance in thin metal films |
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Authors: | J F Cochran and R Turner |
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Institution: | Physics Department, Simon Fraser University, Burnaby, B.C., Canada |
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Abstract: | The velocities of electrons contained in a thin slab are quantized because the component of momentum transverse to the slab faces is quantized. For a free electron gas the transverse velocity is given by |vH| = l( /m) (π/d) where l = 1, 2, 3, …. If a magnetic field is applied normal to the slab, the wave number and frequency dependent conductivity consists of a series of resonant terms. The resonances occur at the Doppler-shifted cyclotron resonance frequencies |ωc| = ω ± p( /m) (π/d)2 where l = 1, 2, 3, …. It is shown that these resonances in the conductivity result in an absorption in pure thin films at low temperatures which is periodic in magnetic field. The semi-classical expression for the absorption is in substantial agreement with the corresponding quantum calculation, and has the virtue that it may be readily extended to non-spherical Fermi surfaces. |
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