Scattering rate via electron-acoustic phonon interaction in quantum wire

Using the continuum phonon model and effective-mass approximation, we have calculated the scattering rate via electron-acoustic phonon interaction in a quantum wire. Both taking and not taking into account electron effective- mass mismatch (EEMM), the scattering rates decrease with increasing electro n energy. This is attributed to rapid decrease of the state density of the quantum wire. The rate for the case with EEMM is lower than that without EE MM, since EEMM call make the barrier drop along the growth direction. The s cattering rate increases with increasing Al concentration, which is attribu ted to lower well height and smaller wave vector along the growth direction . The relative deviation of the scattering rates between the without and wi th EEMM cases decreases with increasing Al concentration because of the low ering of the effective-barrier height caused by EEMM. With increasing well width along the growth direction the scattering rate decreases, which is as cribed to the decrease of wave vector alpha along the a-axis, that is, weak ening of the bounding for electron in the quantum well. (C) 2000 Published by Elsevier Science S.A. All rights reserved.