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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2504.04696 |
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| _version_ | 1866909568658833408 |
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| author | Xu, Jinyuan Guo, Yangyu |
| author_facet | Xu, Jinyuan Guo, Yangyu |
| contents | Understanding the mechanism of interfacial thermal transport is crucial for thermal management of electronics. Recent experiments have shown the strong impact of interfacial roughness on inelastic phonon scattering and interfacial thermal conductance (ITC), while the theoretical modeling and underlying physics remain missing. Through non-equilibrium molecular dynamics simulations with quantum correction, we predict ITC of both sharp and rough Si/Al interfaces in a good agreement with experimental results in a broad range of temperatures. We further introduce a novel spectral energy exchange analysis, which reveals more annihilation of high-frequency phonons and generation of moderate-frequency phonons around the sharp interface compared to its rough counterpart. However, the low-frequency phonons at rough interface shows unexpected stronger inelastic scattering and larger contribution to ITC due to unique emerging interfacial modes. Our work thus promotes both the methodology and understanding of interfacial thermal transport at solid/solid interfaces, and may benefit the design and optimization of thermal interface materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_04696 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Uncovering the roughness effect on inelastic phonon scattering and thermal conductance at interface via spectral energy exchange Xu, Jinyuan Guo, Yangyu Mesoscale and Nanoscale Physics Understanding the mechanism of interfacial thermal transport is crucial for thermal management of electronics. Recent experiments have shown the strong impact of interfacial roughness on inelastic phonon scattering and interfacial thermal conductance (ITC), while the theoretical modeling and underlying physics remain missing. Through non-equilibrium molecular dynamics simulations with quantum correction, we predict ITC of both sharp and rough Si/Al interfaces in a good agreement with experimental results in a broad range of temperatures. We further introduce a novel spectral energy exchange analysis, which reveals more annihilation of high-frequency phonons and generation of moderate-frequency phonons around the sharp interface compared to its rough counterpart. However, the low-frequency phonons at rough interface shows unexpected stronger inelastic scattering and larger contribution to ITC due to unique emerging interfacial modes. Our work thus promotes both the methodology and understanding of interfacial thermal transport at solid/solid interfaces, and may benefit the design and optimization of thermal interface materials. |
| title | Uncovering the roughness effect on inelastic phonon scattering and thermal conductance at interface via spectral energy exchange |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2504.04696 |