= Circular Drude conductivity with a positive-frequency convention
{title2=$\sigma_\pm=\sigma_0/[1+i(\omega\mp\omega_c)\tau]$}
For charge $-e$, field $B\hat z$, time dependence $e^{i\omega t}$ and circular components $E_\pm=E_x\pm iE_y$, the active positive-frequency response is the plus component and its denominator contains $\omega-\omega_c$. Reversing the field or exchanging helicity labels swaps the signs. A printed circular conductivity must state those conventions together.
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