Galvanomagnetic effects in many‐valley semiconductors for strong magnetic and heating electric fields

The effect of the heating of electrons on the conductivity of many‐valley semiconductors in strong (but not quantitizing) transverse magnetic fields is studied. It is shown that at low temperatures the current‐voltage characteristic is of S‐type, when the main mechanism of the intervalley scattering of the hot electrons is the emission of inter‐valley phonons. The anisotropy of conductivity is not only reduced but also changes its sign when the electric field grows. The conductivity in strong magnetic fields can be greater than σ₀ (σ₀ is σ for H ≡ 0, E_x → 0) within a certain region of the electric field strength. All these effects take place as a result of the influence of the Hall field on the heating of electrons and their redistribution with respect to the valleys.