Monitoring anharmonic phonon transport across interfaces in one-dimensional lattice chains
Modeling thermal transport through interfaces has been one of the most challenging problems in nanoscale heat transfer. Although continuous theoretical efforts have been made, there has been no consensus on how to rigorously incorporate temperature effect and anharmonicity. In this paper, we adopt t...
| Main Authors: | , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020
|
| Online Access: | https://hdl.handle.net/1721.1/124689 |
| _version_ | 1826188638031970304 |
|---|---|
| author | Fang, Jun Qian, Xin Zhao, C. Y. Li, Baowen Gu, Xiaokun |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Fang, Jun Qian, Xin Zhao, C. Y. Li, Baowen Gu, Xiaokun |
| author_sort | Fang, Jun |
| collection | MIT |
| description | Modeling thermal transport through interfaces has been one of the most challenging problems in nanoscale heat transfer. Although continuous theoretical efforts have been made, there has been no consensus on how to rigorously incorporate temperature effect and anharmonicity. In this paper, we adopt the self-consistent anharmonic phonon concept for nonlinear lattices to investigate phonon propagation within the materials as well as across interfaces based on equilibrium molecular dynamics simulations. Based on linear response theory, we propose an efficient method to calculate the frequency-dependent transmission coefficient in a nonlinear lattice. The transmission spectrum is extracted directly from velocity correlations, which naturally includes anharmonic effects. Phonon renormalization at finite temperature can also be easily handled using the proposed method. Our results are consistent with the atomistic Green's function method at the limit of weak anharmonicity. For nonlinear lattices under high temperatures, the anharmonicity is found to increase the cutoff frequency of the transmission coefficient due to phonon renormalization. Further analysis shows that the anharmonicity also promotes interfacial thermal conductance by causing the redistribution of the spectral flux of the excited vibrational waves during their propogation. ©2020 |
| first_indexed | 2024-09-23T08:02:27Z |
| format | Article |
| id | mit-1721.1/124689 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:02:27Z |
| publishDate | 2020 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1246892022-09-23T10:30:54Z Monitoring anharmonic phonon transport across interfaces in one-dimensional lattice chains Fang, Jun Qian, Xin Zhao, C. Y. Li, Baowen Gu, Xiaokun Massachusetts Institute of Technology. Department of Mechanical Engineering Modeling thermal transport through interfaces has been one of the most challenging problems in nanoscale heat transfer. Although continuous theoretical efforts have been made, there has been no consensus on how to rigorously incorporate temperature effect and anharmonicity. In this paper, we adopt the self-consistent anharmonic phonon concept for nonlinear lattices to investigate phonon propagation within the materials as well as across interfaces based on equilibrium molecular dynamics simulations. Based on linear response theory, we propose an efficient method to calculate the frequency-dependent transmission coefficient in a nonlinear lattice. The transmission spectrum is extracted directly from velocity correlations, which naturally includes anharmonic effects. Phonon renormalization at finite temperature can also be easily handled using the proposed method. Our results are consistent with the atomistic Green's function method at the limit of weak anharmonicity. For nonlinear lattices under high temperatures, the anharmonicity is found to increase the cutoff frequency of the transmission coefficient due to phonon renormalization. Further analysis shows that the anharmonicity also promotes interfacial thermal conductance by causing the redistribution of the spectral flux of the excited vibrational waves during their propogation. ©2020 NSFC (grant no. 51706134) 2020-04-16T14:40:47Z 2020-04-16T14:40:47Z 2020-02 2019-11 2020-02-27T15:22:12Z Article http://purl.org/eprint/type/JournalArticle 2470-0053 https://hdl.handle.net/1721.1/124689 Fang, Jun, et al., "Monitoring anharmonic phonon transport across interfaces in one-dimensional lattice chains." Physical review E 101 (2020): no. 022133 doi 10.1103/PhysRevE.101.022133 ©2020 Author(s) en 10.1103/PhysRevE.101.022133 Physical review E Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Fang, Jun Qian, Xin Zhao, C. Y. Li, Baowen Gu, Xiaokun Monitoring anharmonic phonon transport across interfaces in one-dimensional lattice chains |
| title | Monitoring anharmonic phonon transport across interfaces in one-dimensional lattice chains |
| title_full | Monitoring anharmonic phonon transport across interfaces in one-dimensional lattice chains |
| title_fullStr | Monitoring anharmonic phonon transport across interfaces in one-dimensional lattice chains |
| title_full_unstemmed | Monitoring anharmonic phonon transport across interfaces in one-dimensional lattice chains |
| title_short | Monitoring anharmonic phonon transport across interfaces in one-dimensional lattice chains |
| title_sort | monitoring anharmonic phonon transport across interfaces in one dimensional lattice chains |
| url | https://hdl.handle.net/1721.1/124689 |
| work_keys_str_mv | AT fangjun monitoringanharmonicphonontransportacrossinterfacesinonedimensionallatticechains AT qianxin monitoringanharmonicphonontransportacrossinterfacesinonedimensionallatticechains AT zhaocy monitoringanharmonicphonontransportacrossinterfacesinonedimensionallatticechains AT libaowen monitoringanharmonicphonontransportacrossinterfacesinonedimensionallatticechains AT guxiaokun monitoringanharmonicphonontransportacrossinterfacesinonedimensionallatticechains |