Acoustic phonons in nanowire superlattices: Azimuthally symmetric torsional modes
Acoustic phonons in nanowire superlattices: Azimuthally symmetric torsional modes
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DOI：
10.1103/physrevb.71.085303
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发表时间：
2005-02
影响因子：
3.7
通讯作者：
S. Mizuno
中科院分区：
文献类型：
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作者：
S. Mizuno
从理论上研究了由两层柱状层交替堆积而成的纳米线超晶格中的振动模。我们以方位对称扭转模为研究对象，对声子色散关系进行了解析计算。我们还推导出了纳米线超晶格中产生的频隙的简单表达式。此外，我们还计算了有限周期数的纳米线超晶格中声子的透过率。在计算结果的基础上，分析了超晶格纵向约束和径向约束的影响。
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.