Electron interaction with confined acoustic phonons in cylindrical quantum wires

2019-10-12 22:51:28

rates electron acoustic scattering phonon

责任者: SeGi Yu;Kim, K.W.;Stroscio, M.A.;Iafrate, G.J.;Ballato, A. 单位: Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA 来源出处: Journal of Applied Physics(J. Appl. Phys. (USA)),1 Sept. 1996,80(5):2815-22 摘要: The effects of phonon confinement on electron-acoustic-phonon scattering is studied in cylindrical semiconductor quantum wires. In the macroscopic elastic continuum model, the confined-phonon dispersion relations are obtained for several crystallographic directions with the two cardinal boundary conditions: free-surface and clamped-surface boundary conditions. The scattering rates due to the deformation potential interaction are obtained for these confined phonons and are compared with those of bulk-like phonons for a number of quantum wire materials. The results show that the inclusion of acoustic phonon confinement effects may be crucial for calculating accurate low-energy electron scattering rates in nanostructures. It is also demonstrated that the scattering rates may be significantly influenced by the direction of phonon propagation, especially for low-energy electrons. Furthermore, it has been found that there is a scaling rule governing the directional dependence of the scattering rates: the directions characterized by small Poisson ratios exhibit large scattering rates 关键词: electron-phonon interactions;semiconductor quantum wires;electron interaction;confined acoustic phonons;cylindrical quantum wires;deformation potential;phonon confinement;electron-acoustic-phonon scattering;macroscopic elastic continuum model;confined-phonon dispersion relations;free-surface;clamped-surface boundary conditions;deformation potential interaction;low-energy electron scattering rates;phonon propagation;low-energy electrons;scaling rule;small Poisson ratios;large scattering rates