  The effects of confinement on electron transport in GaN have been studied via
an ensemble Monte-Carlo code. Excellent agreement is obtained with experimental
data from the literature up to moderate fields. In agreement with experimental
results, negative-differential-conductivity is not observed in velocity-field
curves. The reasons for this are discussed in detail. The dynamics of the
non-equilibrium confined electron-LO phonon system is studied via a bulk phonon
spectrum. In contrast to the bulk electron case hot or non-equilibrium phonons
do not play a significant role in determining the transport properties. This is
explained via the energy and momentum conservation rules for the polar optical
phonon scattering. In addition, impact ionization is shown to be insignificant
for the applied fields considered.
