| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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)† |
| Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China |
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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.
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Received: 14 November 2024
Revised: 12 December 2024
Accepted manuscript online: 17 December 2024
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PACS:
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72.80.Vp
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(Electronic transport in graphene)
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05.60.Gg
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(Quantum transport)
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65.80.Ck
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(Thermal properties of graphene)
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68.90.+g
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(Other topics in structure, and nonelectronic properties of surfaces and interfaces; thin films and low-dimensional structures)
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| Fund: 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). |
Corresponding Authors:
Zhiping Xu
E-mail: xuzp@tsinghua.edu.cn
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Cite this article:
Linxin Zhai(翟麟鑫) and Zhiping Xu(徐志平) Disentangling electronic and phononic thermal transport across two-dimensional interfaces 2025 Chin. Phys. B 34 027202
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