On the scattering of electrons by polar optical phonons in quasi-2D quantum wells

摘要: Numerical calculations have been made of the rates scattering and momentum relaxation electrons caused by unscreened polar optical phonons in quasi-two-dimensional layers, using a simple infinite-depth square-well model. The results are compared with approximate analytic formulae, situation bulk. Some major differences from bulk (i) an abrupt threshold for phonon emission appears, (ii) just above enhanced (iii) is more isotropic. These intimately related to energy dependence density states interaction, expected be largely independent form interaction strongly favours intra-sub-band over inter-sub-band this effect has consequences luminescent spectrum hot injected carriers. large increase rate at transport phenomena.