Acoustic phonons in nanowire superlattices: Azimuthally symmetric torsional modes

被引：20
|
作者：
Mizuno, S [1 ]
机构：
[1] Hokkaido Univ, Grad Sch Engn, Dept Appl Phys, Sapporo, Hokkaido 0608628, Japan
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 08期
关键词：
D O I：
10.1103/PhysRevB.71.085303
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study theoretically vibrational modes in a nanowire superlattice consisting of an alternate stacking of two cylindrical layers. We focus on azimuthally symmetric torsional modes and calculate the phonon dispersion relations analytically. We also derive simple expressions for the frequency gaps generated in the nanowire superlattice. Moreover, we calculate the transmittance of phonons propagating through a nanowire superlattice with the finite number of periods. Based on our calculated results, effects of the superlattice longitudinal confinement and the radial confinement are examined.
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页数：8
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