Optical phonon damping in the ultrathin-layer GaAs/AlAs superlattices

✍ Scribed by M.M. Dvoynenko; A.V. Goncharenko; V.R. Romaniuk; E.F. Venger

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 189 KB
• Volume: 26
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1999.0787

✦ Synopsis

We performed the precision measurements of the near-normal far-infrared reflection and transmission spectra of the MBE-grown (GaAs) n /(AlAs) n (n = 1, 2, 4) superlattices. The results obtained show a noticeable (almost twofold) increase in the AlAs-phonon damping when n is decreased from 4 to 1. We consider possible physical mechanisms of this increase and compare our results with those obtained by other authors. The main implication of the work is that the increase in the TO-phonon damping may be related to interface broadening whose role becomes more important when the superlattice period decreases.