无序硅相的晶格动力学与热导率的空间分辨计算
Lattice dynamics of disordered phases of silicon and spatially resolved computations of thermal conductivity
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中文总结 AI 辅助
本文通过DFT质量势模拟非晶硅,发现其存在异常原子位置波动的简谐模式,并利用位点投影热导率揭示这些动力学决定热传输,推测此现象普遍存在于无序系统。
中文摘要 AI 辅助
无序系统(非晶固体、聚合物和玻璃)的晶格动力学通常与晶体类似物不同。例子包括“两能级系统”和玻色峰。在这里,我们表明即使是古老的材料非晶硅也提供了新的发现:(1)使用DFT质量的原子间势研究的现实网络显示出存在具有异常大的原子位置均方根波动的简谐模式,以及(2)这些动力学决定了热传输过程。我们使用位点投影热导率[C. Ugwumadu等人 Phys. Status Solidi B 263, e202500316 (2026)]将原子动力学与传输相关联,并推测这些观察结果与其他无序系统相关。
英文摘要
The lattice dynamics of disordered systems (amorphous solids, polymers and glasses) are often distinct from crystalline analogues. Examples include the "two-level systems" and the Boson peak. Here, we show that even the venerable material amorphous silicon offers new wrinkles: (1) realistic networks studied with DFT-quality interatomic potentials show the existence of harmonic modes exhibiting anomalously large root-mean-square variation in atomic positions, and (2) these dynamics determine the processes of heat transport. We correlate the atomic dynamics with transport using the site-projected thermal conductivity [C. Ugwumadu et. al Phys. Status Solidi B 263, e202500316 (2026)], and conjecture that these observations are relevant to other disordered systems.
发表机构
- Ohio University(俄亥俄大学)
- Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室)
- University of Connecticut(康涅狄格大学)
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