2.4.4.1 Heat Conductivity

The isothermal heat conductivity of electrons (holes) $\kappa_n$ ($\kappa_p$) describes the electron (hole) heat current density $\mathbf{Q_n}$ ( $\mathbf{Q_p}$) driven by a temperature gradient $\nabla T$ under zero current conditions:

$$\kappa_{n,p} = - \frac{\mathbf{Q_{n,p}} \cdot \nabla T}{\vert\nabla T\vert^2} \quad \mathbf{J_{n,p}}=0$$ (2.7)