In two-band models of higher-wave magnets, the only nonzero nonlinear spin Drude conductivity has order equal to one less than the number of Fermi-surface nodes.
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Third-order and fifth-order nonlinear spin-current generation in $g$-wave and $i$-wave altermagnets, and perfectly nonreciprocal spin-current in $f$-wave magnets
In two-band models of higher-wave magnets, the only nonzero nonlinear spin Drude conductivity has order equal to one less than the number of Fermi-surface nodes.