Issue
EPL
Volume 88, Number 3, November 2009
Article Number 36003
Number of page(s) 5
Section Condensed Matter: Structural, Mechanical and Thermal Properties
DOI http://dx.doi.org/10.1209/0295-5075/88/36003
Published online 16 November 2009
EPL, 88 (2009) 36003
DOI: 10.1209/0295-5075/88/36003

Modification of the phonon thermal conductivity in spatially confined semiconductor nanofilms under stress fields

Linli Zhu and Xiaojing Zheng

Key Laboratory of Mechanics on Western Disaster and Environment, Ministry of Education, PRC and Department of Mechanics and Engineering Science, College of Civil Engineering and Mechanics, Lanzhou University - Lanzhou, Gansu 730000, PRC

zhulinl03@lzu.cn
xjzheng@lzu.edu.cn

received 2 August 2009; accepted in final form 19 October 2009; published November 2009
published online 16 November 2009

Abstract
In the presence of stress fields, the phonon thermal conductivity of spatially confined semiconductor nanofilms is investigated. The phonon confinement and acoustoelastic effects are taken into account on the phonon dispersion in nanostructures. Specifically, within the continuum elasticity theory, we quantitatively analyze the phonon properties of confined Si nanofilms under stress fields. Numerical results reveal that stress can alter the phonon thermal conductivity of Si nanofilms remarkably. The effect of temperature and physical dimensions on phonon thermal conductivity has also been found to be sensitive to the presence of stress.

PACS
63.22.-m - Phonons or vibrational states in low-dimensional structures and nanoscale materials.
66.70.-f - Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves.
68.60.Bs - Mechanical and acoustical properties.

© EPLA 2009