Far-infrared magnetotransmission experiments on n-type InSb in the parallel Voigt geometry (→E∥→B⊥→k) conclusively demonstrate that the electric-dipole-excited spin resonance (EDSR) of conduction and donor-bound electrons in this material is allowed through lack of inversion symmetry. Quite unexpectedly for this geometry, the EDSR spectra also reveal an anomalous dependence on the sign of either →B or →k. It is shown, through time-reversal-symmetry arguments, that the above behavior represents an explicit contribution of the photon momentum to the dielectric response function.
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Dobrowolska et al. (1983) studied this question.
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