中国物理B ›› 2020, Vol. 29 ›› Issue (12): 126503-.doi: 10.1088/1674-1056/abbbe6

所属专题: SPECIAL TOPIC — Phononics and phonon engineering

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  • 收稿日期:2020-06-26 修回日期:2020-09-13 接受日期:2020-09-28 出版日期:2020-12-01 发布日期:2020-12-02

Lattice thermal conductivity of β12 and χ3 borophene

Jia He(何佳), Yulou Ouyang(欧阳宇楼), Cuiqian Yu(俞崔前), Pengfei Jiang(蒋鹏飞), Weijun Ren(任卫君), and Jie Chen(陈杰)†   

  1. Center for Phononics and Thermal Energy Science, China-EU Joint Laboratory for Nanophononics, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
  • Received:2020-06-26 Revised:2020-09-13 Accepted:2020-09-28 Online:2020-12-01 Published:2020-12-02
  • Contact: Corresponding author. E-mail: jie@tongji.edu.cn
  • Supported by:
    Project supported in part by the National Key Research and Development Program of China (Grant No. 2016YFA0200901), the National Natural Science Foundation of China (Grant No. 11890703), the Science and Technology Commission of Shanghai Municipality, China (Grant Nos. 19ZR1478600 and 18JC1410900), the Fundamental Research Funds for the Central Universities, China (Grant No. 22120200069), and the Open Fund of Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion (Grant No. 2018TP1037_201901).

Abstract: Borophene allotropes have many unique physical properties due to their polymorphism and similarity between boron and carbon. In this work, based on the density functional theory and phonon Boltzmann transport equation, we investigate the lattice thermal conductivity $\kappa $ of both β 12 and χ3 borophene. Interestingly, these two allotropes with similar lattice structures have completely different thermal transport properties. β12 borophene has almost isotropic $\kappa $ around 90 W/(mK) at 300 K, while $\kappa $ of χ3 borophene is much larger and highly anisotropic. The room temperature $\kappa $ of χ 3 borophene along the armchair direction is 512 W/(mK), which is comparable to that of hexagonal boron nitride but much higher than most of the two-dimensional materials. The physical mechanisms responsible for such distinct thermal transport behavior are discussed based on the spectral phonon analysis. More interestingly, we uncover a unique one-dimensional transport feature of transverse acoustic phonon in χ3 borophene along the armchair direction, which results in a boost of phonon relaxation time and thus leads to the significant anisotropy and ultrahigh thermal conductivity in χ3 borophene. Our study suggests that χ 3 borophene may have promising application in heat dissipation, and also provides novel insights for enhancing the thermal transport in two-dimensional systems.

Key words: borophene, thermal conductivity, two-dimensional (2D) material, density functional theory

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

  • 65.80.-g