中国物理B ›› 2025, Vol. 34 ›› Issue (2): 27202-027202.doi: 10.1088/1674-1056/ad9ffd

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Disentangling electronic and phononic thermal transport across two-dimensional interfaces

Linxin Zhai(翟麟鑫) and Zhiping Xu(徐志平)†   

  1. Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
  • 收稿日期:2024-11-14 修回日期:2024-12-12 接受日期:2024-12-17 出版日期:2025-02-15 发布日期:2025-01-15
  • 通讯作者: Zhiping Xu E-mail:xuzp@tsinghua.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12425201 and 52090032) and the National Key Basic Research Program of China (Grant No. 2022YFA1205400).

Disentangling electronic and phononic thermal transport across two-dimensional interfaces

Linxin Zhai(翟麟鑫) and Zhiping Xu(徐志平)†   

  1. Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
  • Received:2024-11-14 Revised:2024-12-12 Accepted:2024-12-17 Online:2025-02-15 Published:2025-01-15
  • Contact: Zhiping Xu E-mail:xuzp@tsinghua.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12425201 and 52090032) and the National Key Basic Research Program of China (Grant No. 2022YFA1205400).

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摘要： Electrical and thermal transport at two-dimensional (2D) interfaces is critical for semiconductor technology, yet their interplay remains unclear. We report a theoretical proposal to separate electronic and phononic contributions to thermal conductance at 2D interfaces with graphene, which is validated by non-equilibrium Green's function calculations and molecular dynamics simulations for graphene-gold contacts. Our results reveal that while metal-graphene interfaces are transparent for both electrons and phonons, non-covalent graphene interfaces block electronic tunneling beyond two layers but not phonon transport. This suggests that the Wiedemann-Franz law can be experimentally tested by measuring transport across interfaces with varying graphene layers.

关键词: electrical and thermal transport, 2D interfaces, Wiedemann-Franz law, theoretical proposal

Abstract: Electrical and thermal transport at two-dimensional (2D) interfaces is critical for semiconductor technology, yet their interplay remains unclear. We report a theoretical proposal to separate electronic and phononic contributions to thermal conductance at 2D interfaces with graphene, which is validated by non-equilibrium Green's function calculations and molecular dynamics simulations for graphene-gold contacts. Our results reveal that while metal-graphene interfaces are transparent for both electrons and phonons, non-covalent graphene interfaces block electronic tunneling beyond two layers but not phonon transport. This suggests that the Wiedemann-Franz law can be experimentally tested by measuring transport across interfaces with varying graphene layers.

Key words: electrical and thermal transport, 2D interfaces, Wiedemann-Franz law, theoretical proposal

中图分类号:  (Electronic transport in graphene)

  • 72.80.Vp
05.60.Gg (Quantum transport) 65.80.Ck (Thermal properties of graphene) 68.90.+g (Other topics in structure, and nonelectronic properties of surfaces and interfaces; thin films and low-dimensional structures)