,Phonon Transport and Thermal Conductivity in an Acoustic Filter

• 作 者: LU Jian-Duo SHAO Liang HOU Yang-Lai YI Lin
• 机 构: Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081“,”Department
• 出 处: 中国物理快报（英文版）
• 发表日期: 2007年3期

We investigate the phonon ballistic transmission and the thermal conductivity in a dielectric quantum structure.It is found that these observable quantities sensitively depend on geometric parameters, and are of quantum character. The total transmission coefficient as a function of the reduced waveguide-length exhibits periodical belaviour and the reduced thermal conductance decreases below the ideal universal value for the low temperature.Our results show that one can control the thermal conductivity of the structure and make all kinds of acoustic filters to match practical requirements in devices by adjustingthe geometric parameters.