Landau filling factor
= Landau filling factor
{title2=$\nu_{\rm fill}$}
The ratio $\nu_{\mathrm{fill}}=n_sh/(eB)$ for sheet <carrier density> $n_s$. Each resolved <spin> branch has degeneracy $eB/h$ per unit <area>; an unresolved orbital level can contain two <spin> branches. A plateau index need not equal total filling everywhere on a finite-width plateau.