Electrical current flow

Comparing Eq. (5.34) with

\vec{j} = σ \vec{E},

(5.35)

we find

σ = \frac{q^{2} τ n_{e}}{m^{*}};

(5.36)

including the mobility

μ_{e} := \frac{q τ}{m^{*}},

(5.37)

we finally get

σ = q μ_{e} n_{e} .

(5.38)

Additional information and several illustrative graphics can be found in the MaWi II script.