Anharmonic decay of high-frequency LA modes in quasi-isotropic III-nitrides. (23rd November 2020)

• Record Type: Journal Article
• Authors: Mohamed, Ahmed; Singh, Ramji; Dutta, Mitra; Stroscio, Michael A
• Is Part Of: Journal of physics. Volume 33:Number 7(2021)
• Publication Date: 2020-11-23
• Subjects: acoustic phonons -- III–V semiconductors -- phonon decay rates -- probability density -- wurtzite III-nitrides; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/abc808
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We report for the first time an estimation of the spontaneous decay rates at room temperature in a selection of nitride-based nanostructures that are quasi-isotropic. We numerically calculate the phonon distribution functions and the decay rates and find that the decay channel LA → TA + TA dominates over the decay channel LA → LA + TA, which confirms Klemens' prediction [1 ] that LA phonon will primarily split into two doubly degenerate TA phonons through a greater variety of decay channels compared to the decay of LA into two modes, one belonging to the longitudinal acoustic and the other to the transverse acoustic branch.