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Colloquium: Phononic thermal properties of two-dimensional materials

Xiaokun Gu, Yujie Wei*, Xiaobo Yin, Baowen Li†, and Ronggui Yang‡

Xiaokun Gu

  • Institute of Engineering Thermophysics, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China 200240 and Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309, USA

Yujie Wei*

  • LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China, 100190

Xiaobo Yin

  • Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309, USA and Materials Science and Engineering Program, University of Colorado, Boulder, Colorado 80309, USA

Baowen Li†

  • Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309, USA

Ronggui Yang‡

  • Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309, USA and Materials Science and Engineering Program, University of Colorado, Boulder, Colorado 80309, USA

  • *yujie_wei@lnm.imech.ac.cn
  • †Baowen.Li@Colorado.Edu
  • ‡Ronggui.Yang@Colorado.Edu
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Rev. Mod. Phys. 90, 041002 – Published 13 November, 2018

DOI: https://doi.org/10.1103/RevModPhys.90.041002

Abstract

Following the emergence of many novel two-dimensional (2D) materials beyond graphene, interest has grown in exploring implications for fundamental physics and practical applications ranging from electronics, photonics, and phononics to thermal management and energy storage. In this Colloquium, a summary and comparison are given of the phonon properties, such as phonon dispersion and relaxation time, of pristine 2D materials with single-layer graphene to understand the role of crystal structure and dimension on thermal conductivity. A comparison is made of the phonon properties, contrasting idealized 2D crystals, realistic 2D crystals, and 3D crystals, and synthesizing this to develop a physical picture of how the sample size of 2D materials affects their thermal conductivity. The effects of geometry such as the number of layers and the nanoribbon width, together with the presence of defects, mechanical strain, and substrate interactions on the thermal properties of 2D materials are discussed. Intercalation affects both the group velocities and phonon relaxation times of layered crystals and thus tunes the thermal conductivity along both the through-plane and basal-plane directions. This Colloquium concludes with a discussion of the challenges in theoretical and experimental studies of thermal transport in 2D materials. The rich and special phonon physics in 2D materials make them promising candidates for exploring novel phenomena such as topological phonon effects and applications such as phononic quantum devices.

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Rev. Mod. Phys. 90, 041002– Published 13 November, 2018
  • Received 15 May 2017
Article part of CHORUS
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