Hole-drift velocity in natural diamond

The drift velocity of holes in natural diamond is analyzed for a wide range of temperatures $85\le T\le 700$ K and fields ${10}^2<E<\mathrm{}6\mathrm{}\times {10}^4$ V/cm applied parallel to $〈100〉$ and $〈110〉$ crystallographic directions. Experiments are carried out with the time-of-flight technique, and theory uses a Monte Carlo method. The microscopic interpretation is based on a two-spherical and parabolic band model and considers lattice scattering only. Values $m_h=1.1\mathrm{}{m}_o$ and $m_l=0.3\mathrm{}{m}_o$ for heavy-and light-hole effective masses are found.