We have studied the effect of a nonequilibrium population of optical phonons on two-dimensional hot-electron transport in a strong electric field. We find that the presence of hot phonons increases the mobility at weak field. At high field, on the contrary, it enhances electron heating, so that the nonlinear mobility is reduced. The optical-phonon distribution function is strongly anisotropic in the direction of the electric field. The characteristic time scale governing the relaxation towards the steady state becomes much longer in the presence of nonequilibrium phonons.
ASJC Scopus subject areas
- Condensed Matter Physics