Abstract
We present theoretical investigations of atomic vibrations in thin ${(\mathrm{GaAs})}_{n}{(\mathrm{AlAs})}_{n}$ superlattices grown in the favored [001] direction, and also the less well-studied [110] direction, using the adiabatic bond charge model. In the acoustic range we confirm the existence of minigaps at the zone center and edges, and also provide evidence for acoustic mode anticrossing and confinement. In the optical range we observe folding, confinement, and mode anisotropy behaviors. The anisotropy is markedly reduced for the [110] system with an angular dispersion opposite to that for the [001] system. The interface mode characteristics are also different for the two growth directions. The highest confined optical mode in the [110] system reaches its bulk value in roughly half the layer width of the [001] system.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
