Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms

doi:10.1088/1674-1056/28/8/086501

中国物理B ›› 2019, Vol. 28 ›› Issue (8): 86501-086501.doi: 10.1088/1674-1056/28/8/086501

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms

Shu-Sen Yang(杨树森), Yang Hou(侯阳), Lin-Li Zhu(朱林利)

1 Department of Engineering Mechanics, and Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Zhejiang University, Hangzhou 310027, China;
2 School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China

收稿日期:2019-05-22 修回日期:2019-06-16 出版日期:2019-08-05 发布日期:2019-08-05
通讯作者: Lin-Li Zhu E-mail:llzhu@zju.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11772294, 11621062, and 11302189) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2017QNA4031).

Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms

Shu-Sen Yang(杨树森)^1,2, Yang Hou(侯阳)¹, Lin-Li Zhu(朱林利)¹

1 Department of Engineering Mechanics, and Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Zhejiang University, Hangzhou 310027, China;
2 School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China

Received:2019-05-22 Revised:2019-06-16 Online:2019-08-05 Published:2019-08-05
Contact: Lin-Li Zhu E-mail:llzhu@zju.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11772294, 11621062, and 11302189) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2017QNA4031).

摘要/Abstract

摘要：

Surface charges can modify the elastic modulus of nanostructure, leading to the change of the phonon and thermal properties in semiconductor nanostructure. In this work, the influence of surface charges on the phonon properties and phonon thermal conductivity of GaN nanofilm are quantitatively investigated. In the framework of continuum mechanics, the modified elastic modulus can be derived for the nanofilm with surface charges. The elastic model is presented to analyze the phonon properties such as the phonon dispersion relation, phonon group velocity, density of states of phonons in nanofilm with the surface charges. The phonon thermal conductivity of nanofilm can be obtained by considering surface charges. The simulation results demonstrate that surface charges can significantly change the phonon properties and thermal conductivity in a GaN nanofilm. Positive surface charges reduce the phonon energy and phonon group velocity but increase the density of states of phonons. The surface charges can change the size and temperature dependence of phonon thermal conductivity of GaN nanofilm. Based on these theoretical results, one can adjust the phonon properties and temperature/size dependent thermal conductivity in GaN nanofilm by changing the surface charges.

关键词: surface charges, GaN nanofilm, elastic model, phonon properties, thermal conductivity

Abstract:

Key words: surface charges, GaN nanofilm, elastic model, phonon properties, thermal conductivity

中图分类号: (Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)

65.80.-g

63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials) 43.35.Gk (Phonons in crystal lattices, quantum acoustics) 44.10.+i (Heat conduction)

杨树森, 侯阳, 朱林利. Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms[J]. 中国物理B, 2019, 28(8): 86501-086501.

Shu-Sen Yang(杨树森), Yang Hou(侯阳), Lin-Li Zhu(朱林利). Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms[J]. Chin. Phys. B, 2019, 28(8): 86501-086501.

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Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms

Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms

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