Interface and confined phonons in stepped quantum wells

P. Kinsler, R. W. Kelsall, P. Harrison

Research output: Contribution to journalConference articlepeer-review

11 Citations (Scopus)


The simple symmetric and antisymmetric interface-phonon modes of a square quantum well do not occur in an asymmetric quantum well. The presence of extra materials and interfaces affects the potentials of the interface (IF) phonons in addition to the widely recognized effect on the electronic wave functions. Our `stepped' quantum well structures have phonon modes (potentials) localized at the well/step interface, so these structures have 8 confined-LO (LC) phonon modes and 10 IF phonons. We calculate the non-trivial dispersion of the IF phonons for increasing asymmetry (step height); classify the resulting phonon potentials into `even-like', `odd-like', and `centred'; and explain the strongest electron-IF-phonon scattering processes in terms of their matrix elements. The result is that the LC scattering rates increase with increasing asymmetry, whilst the IF rates decrease.

Original languageEnglish
Pages (from-to)507-509
Number of pages3
JournalPhysica B: Condensed Matter
Publication statusPublished - 1 Mar 1999
Externally publishedYes
EventProceedings of the 1998 9th International Conference on Phonon Scattering in Condensed Matter - Lancaster, United Kingdom
Duration: 26 Jul 199831 Jul 1998
Conference number: 9


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