Abstract
We investigate the predicted lateral shift of a normally incident
electromagnetic beam upon reflection off an antiferromagnet in an
external magnetic field in terms of power flow. In the absence of
damping, there is power flow along the interface in the reststrahl
regions, even at normal incidence, and this leads directly to a shift
similar to the Goos-Hanchen shift normally associated with oblique
incidence radiation. In the bulk regions, such a shift is still possible
even without this type of power flow. In this case the beam transmitted
into the antiferromagnet is displaced in the direction opposite to that
of the reflected beam, thus ensuring overall flux continuity.
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