Non-equivalent minima scattering in n-type Ga1−xAlxAs alloys from Monte Carlo methods

Using the known conduction band structure for Ga_1?xAl_xAs alloys, the electron drift mobilities in the Γ, L and X minima have been calculated as a function of pressure using Monte Carlo methods. These mobilities are found to decrease first, show a minimum at a pressure near the Γ-L minima crossover and then increase again with pressure due to strong non-equivalent intervalley scattering. The calculated Hall mobility also shows similar behaviour and the results are in qualitative agreement with the experimental observations reported earlier.