TEMPERATURE-DEPENDENCE OF ELECTRON-MOBILITY IN A FREESTANDING QUANTUM-WELL

We have studied theoretically the low-field electron transport in a,fr ee-standing quantum well where the deformation potential scattering of electrons by acoustic phonons is the major mechanism of the electron relaxation. The quantisation of acoustic phonons, their multisubband s pectrum, and the exact form of the dilatational acoustic modes are tak en into account. We have numerically solved the kinetic equation for e lectrons in the low electric field limit. At low lattice temperature t he obtained electron distribution function has several peaks associate d with scattering by different dilatational phonons. The electron mobi lity has temperature dependence similar to that described by the Bloch -Gruneisen formula, however pre have obtained T-3 dependence of mobili ty in the low temperature legion.