Modification of the three-phonon Umklapp process in a quantum wire

被引:21
作者
Khitun, A [1 ]
Wang, KL [1 ]
机构
[1] Univ Calif Los Angeles, Dept Elect Engn, Device Res Lab, Los Angeles, CA 90095 USA
关键词
D O I
10.1063/1.1391230
中图分类号
O59 [应用物理学];
学科分类号
摘要
We have investigated the modification of the three-phonon Umklapp process in a quantum wire caused by the effect of phonon confinement. Our formalism rigorously takes into account variations in phonon group velocity as well as the presence of an energy gap between the phonon modes due to the quantization of the radial phonon wave vector. Numerical calculations of the Umklapp relaxation rate were carried out for Si wires. Based on the obtained results we predict the suppression of the acoustic phonon modes decay at low temperatures that can lead to the unusual thermal conductivity increase. We also present a simplified empiric formula for the Umklapp relaxation rate calculation in a quantum wire. (C) 2001 American Institute of Physics.
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页码:851 / 853
页数:3
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