2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/100358Time delay in electron propagation through a finite periodic system such as a semiconductor superlattice is studied by direct numerical solution of the time-dependent Schrödinger equation. It is found that addition of an anti-reflection coating significantly reduces the time delay, in addition to increasing the transmissivity.Version 3: revised sec III b., added appendix and refs. 10 pages, 11 figs. Version 2: major revision, especially pages 5-9; additional references, 9 pages, 11 figures. Version 1 was 7 pages, 11 figuresMesoscale and Nanoscale Physicstext