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Measuring phonon dispersion at an interface

Author

Listed:
  • Ruishi Qi

    (Peking University
    Peking University
    University of California at Berkeley)

  • Ruochen Shi

    (Peking University
    Peking University)

  • Yuehui Li

    (Peking University
    Peking University)

  • Yuanwei Sun

    (Peking University
    Peking University)

  • Mei Wu

    (Peking University
    Peking University)

  • Ning Li

    (Peking University
    Peking University
    Peking University)

  • Jinlong Du

    (Peking University)

  • Kaihui Liu

    (Peking University
    Collaborative Innovation Center of Quantum Matter
    Peking University)

  • Chunlin Chen

    (Chinese Academy of Sciences)

  • Ji Chen

    (Peking University
    Collaborative Innovation Center of Quantum Matter)

  • Feng Wang

    (University of California at Berkeley)

  • Dapeng Yu

    (Peking University
    Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology)

  • En-Ge Wang

    (Peking University
    Chinese Academy of Sciences
    Liaoning University)

  • Peng Gao

    (Peking University
    Peking University
    Collaborative Innovation Center of Quantum Matter
    Peking University)

Abstract

The breakdown of translational symmetry at heterointerfaces leads to the emergence of new phonon modes localized at the interface1. These modes have an essential role in thermal and electrical transport properties in devices, especially in miniature ones wherein the interface may dominate the entire response of the device2. Although related theoretical work began decades ago1,3–5, experimental research is totally absent owing to challenges in achieving the combined spatial, momentum and spectral resolutions required to probe localized modes. Here, using the four-dimensional electron energy-loss spectroscopy technique, we directly measure both the local vibrational spectra and the interface phonon dispersion relation for an epitaxial cubic boron nitride/diamond heterointerface. In addition to bulk phonon modes, we observe modes localized at the interface and modes isolated from the interface. These features appear only within approximately one nanometre around the interface. The localized modes observed here are predicted to substantially affect the interface thermal conductance and electron mobility. Our findings provide insights into lattice dynamics at heterointerfaces, and the demonstrated experimental technique should be useful in thermal management, electrical engineering and topological phononics.

Suggested Citation

  • Ruishi Qi & Ruochen Shi & Yuehui Li & Yuanwei Sun & Mei Wu & Ning Li & Jinlong Du & Kaihui Liu & Chunlin Chen & Ji Chen & Feng Wang & Dapeng Yu & En-Ge Wang & Peng Gao, 2021. "Measuring phonon dispersion at an interface," Nature, Nature, vol. 599(7885), pages 399-403, November.
  • Handle: RePEc:nat:nature:v:599:y:2021:i:7885:d:10.1038_s41586-021-03971-9
    DOI: 10.1038/s41586-021-03971-9
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    Citations

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    Cited by:

    1. Ning Li & Ruochen Shi & Yifei Li & Ruishi Qi & Fachen Liu & Xiaowen Zhang & Zhetong Liu & Yuehui Li & Xiangdong Guo & Kaihui Liu & Ying Jiang & Xin-Zheng Li & Ji Chen & Lei Liu & En-Ge Wang & Peng Gao, 2023. "Phonon transition across an isotopic interface," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. Alejo, Anna & Jenkins, Robert & Reuge, Nicolas & Yao, Haogen, 2023. "Understanding and addressing the post-pandemic learning disparities," International Journal of Educational Development, Elsevier, vol. 102(C).
    3. Ruochen Shi & Qize Li & Xiaofeng Xu & Bo Han & Ruixue Zhu & Fachen Liu & Ruishi Qi & Xiaowen Zhang & Jinlong Du & Ji Chen & Dapeng Yu & Xuetao Zhu & Jiandong Guo & Peng Gao, 2024. "Atomic-scale observation of localized phonons at FeSe/SrTiO3 interface," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    4. Xuexi Yan & Yixiao Jiang & Qianqian Jin & Tingting Yao & Weizhen Wang & Ang Tao & Chunyang Gao & Xiang Li & Chunlin Chen & Hengqiang Ye & Xiu-Liang Ma, 2023. "Interfacial interaction and intense interfacial ultraviolet light emission at an incoherent interface," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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