科研之友
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摘要
By developing the mode matching numerical technique, we investigate the ballistic phonon thermal transport through a cylindrical semiconductor nanowire modulated with a coupling nanocavity. It is found that the phonon transmission exhibits the periodical transmission properties in low frequency region. The resonant transmission and reflection behaviors of acoustic phonon modes at particular energy can be observed. In the limit T > 0, the thermal conductance approaches the universal quantum value pi(2)k(B)(2)T/3h, and such a quantum is robust against all geometrical parameters. However, the thermal conductance exhibits nonmonotonic behaviors with increasing temperature and can be modulated by adjusting geometrical parameters of the nanocavity. VC 2011 American Institute of Physics. [doi:10.1063/1.3671643]
- 出版日期2011-12-15
- 单位湖南大学
