Selective transmission and enhanced thermal conductance of ballistic phonon by nanocavities embedded in a narrow constriction

• Published in: Journal of physics. D, Applied physics Applied physics, 2009-01, Vol.42 (1), p.015101-015101 (5)
• Main Authors: Huang, Wei-Qing, Huang, Bai-Yun, Yi, Dan-Qing, Wang, Ming-Pu, Huang, Gui-Fang, Wang, Ling-Ling
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Lattice dynamics; Phonons in low-dimensional structures and small particles; Physics
• ISSN: 0022-3727; 1361-6463
• DOI: 10.1088/0022-3727/42/1/015101

The effects of nanocavities embedded in a narrow constriction on ballistic phonon transport in a semiconductor nanowire are investigated. It is shown that when more than one nanocavity is embedded in a narrow constriction with a fixed length, the nanowire has selective transmission and filter actions for the ballistic phonon. The number of resonant transmission peaks increases with the number n of cavities, while the frequencies of the main peaks are independent of n. The thermal conductance can be enhanced significantly, and the enhancement alters in different temperature ranges with the number n of cavities, depending on the competition between the transmission enhancement and scatter enhancement of the ballistic phonon. This structure may be a promising candidate for selective frequency generator and filter for the ballistic phonon in nanophononics.