Yang Lin, Tao Yi, Liu Jinyu, Liu Chenhan, Zhang Qian, Akter Manira, Zhao Yang, Xu Terry T, Xu Yaqiong, Mao Zhiqiang, Chen Yunfei, Li Deyu
Department of Mechanical Engineering , Vanderbilt University , Nashville , Tennessee 37235 , United States.
School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments , Southeast University , Nanjing 210096 , People's Republic of China.
Nano Lett. 2019 Jan 9;19(1):415-421. doi: 10.1021/acs.nanolett.8b04206. Epub 2018 Dec 14.
The last two decades have seen tremendous progress in quantitative understanding of several major phonon scattering mechanisms (phonon-phonon, phonon-boundary, phonon-defects), as they are the determinant factors in lattice thermal transport, which is critical for the proper functioning of various electronic and energy conversion devices. However, the roles of another major scattering mechanism, electron-phonon (e-ph) interactions, remain elusive. This is largely due to the lack of solid experimental evidence for the effects of e-ph scattering in the lattice thermal conductivity for the material systems studied thus far. Here we show distinct signatures in the lattice thermal conductivity observed below the charge density wave transition temperatures in NbSe nanowires, which cannot be recaptured without considering e-ph scattering. Our findings can serve as the cornerstone for quantitative understanding of the e-ph scattering effects on lattice thermal transport in many technologically important materials.
在过去二十年里，在对几种主要声子散射机制（声子 - 声子、声子 - 边界、声子 - 缺陷）的定量理解方面取得了巨大进展，因为它们是晶格热传输的决定性因素，而晶格热传输对于各种电子和能量转换设备的正常运行至关重要。然而，另一种主要散射机制，即电子 - 声子（e - ph）相互作用的作用仍然难以捉摸。这主要是由于迄今为止所研究的材料系统中，缺乏关于e - ph散射对晶格热导率影响的可靠实验证据。在这里，我们展示了在NbSe纳米线中电荷密度波转变温度以下观察到的晶格热导率的明显特征，如果不考虑e - ph散射，这些特征就无法重现。我们的发现可以作为定量理解e - ph散射对许多技术上重要材料的晶格热传输影响的基石。
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