Helicon-Wave Propagation in InSb

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Abstract
Measurements have been made of the phase velocity and attenuation of helicon waves at microwave frequencies propagated along cylindrical samples of InSb at 77°K. Two of the modes of propagation (m = 0 and m = 1) were studied in two different samples. Experimental results are compared to a theory of Klozenberg et al., which takes into account the vacuum fields of the wave. Phase‐velocity measurements are in good agreement with theory, but attenuation results are in some cases substantially lower due, in part, to displacement current effects neglected in the theory. No effects were observed when the electrons were subject to a pulsed drift field.

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