硅/锗超晶中的声子

IF 0.9 4区物理与天体物理 Q4 PHYSICS, CONDENSED MATTER

Physics of the Solid State Pub Date : 2024-03-08 DOI:10.1134/S1063783424600365

D. L. Nika, E. P. Pokatilov, N. D. Zincenco

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引用次数: 0

摘要

摘要介绍了硅/锗三维量子点超晶格（超晶体）中声子的理论研究。在面心立方晶胞分子动力学模型框架内计算了声子能谱。研究了声子状态密度和声子群速度对声子能量的依赖性；发现在声子能量（\hbar \omega > 10\) meV 的宽范围内，平均声子速度接近于零。这些结果使我们能够预测超晶体中极低的晶格热导率值和相应较高的热电功勋值 ZT。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Acoustic Phonons in a Si/Ge Supracrystal

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Acoustic Phonons in a Si/Ge Supracrystal

The theoretical investigation of acoustic phonons in Si/Ge three-dimensional quantum dots superlattices (supracrystals) is presented. The acoustic phonon energy spectra are calculated in the framework of the face-centered cubic cell molecular-dynamic model. The dependencies of phonon density of states and phonon group velocity on the phonon energy are studied; the average phonon velocity is found to be close to zero in the wide range of phonon energies \(\hbar \omega > 10\) meV. The results allow us to predict the extremely low value of the lattice thermal conductivity in supracrystals and correspondingly high value of the thermoelectric figure of merit ZT.

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来源期刊

Physics of the Solid State 物理-物理：凝聚态物理

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

2-4 weeks

期刊介绍： Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.