Abstract
We report Larmor precession in bulk InSb observed in the time domain from $77\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The optically oriented polarization precesses coherently even at $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The inferred Zeeman spin splitting is strongly nonparabolic, and the electron $g$ factor $({g}^{*})$ is in good agreement with $\mathbf{k}∙\mathbf{p}$ theory (provided we take only the dilational contribution to the change in energy gap with temperature). We also show here that correct application of the 14-band $\mathbf{k}∙\mathbf{p}$ model agrees with apparently anomalous trends previously reported for GaAs and confirm that the most widely quoted formula for ${g}^{*}$ in GaAs is incomplete.
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