Electron-correlation effects in the $g$-factor of light Li-like ions

We investigate electron-correlation effects in the $g$-factor of the ground state of Li-like ions. Our calculations are performed within the nonrelativistic quantum electrodynamics (NRQED) expansion up to two leading orders in the fine-structure constant $\alpha$, ${\alpha }^2$ and ${\alpha }^3$. The dependence of the NRQED results on the nuclear charge number $Z$ is studied and the individual $1\mathrm{/}Z$-expansion contributions are identified. Combining the obtained data with the results of the all-order (in $Z\alpha$) calculations performed within the $1\mathrm{/}Z$ expansion, we derive the unified theoretical predictions for the $g$-factor of light Li-like ions.