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Nanoscale imaging of phonon dynamics by electron microscopy

Author

Listed:
  • Chaitanya A. Gadre

    (University of California Irvine)

  • Xingxu Yan

    (University of California Irvine
    University of California Irvine)

  • Qichen Song

    (Massachusetts Institute of Technology)

  • Jie Li

    (University of California Irvine)

  • Lei Gu

    (University of California Irvine)

  • Huaixun Huyan

    (University of California Irvine)

  • Toshihiro Aoki

    (University of California Irvine)

  • Sheng-Wei Lee

    (National Central University)

  • Gang Chen

    (Massachusetts Institute of Technology)

  • Ruqian Wu

    (University of California Irvine)

  • Xiaoqing Pan

    (University of California Irvine
    University of California Irvine
    University of California Irvine)

Abstract

Spatially resolved vibrational mapping of nanostructures is indispensable to the development and understanding of thermal nanodevices1, modulation of thermal transport2 and novel nanostructured thermoelectric materials3–5. Through the engineering of complex structures, such as alloys, nanostructures and superlattice interfaces, one can significantly alter the propagation of phonons and suppress material thermal conductivity while maintaining electrical conductivity2. There have been no correlative experiments that spatially track the modulation of phonon properties in and around nanostructures due to spatial resolution limitations of conventional optical phonon detection techniques. Here we demonstrate two-dimensional spatial mapping of phonons in a single silicon–germanium (SiGe) quantum dot (QD) using monochromated electron energy loss spectroscopy in the transmission electron microscope. Tracking the variation of the Si optical mode in and around the QD, we observe the nanoscale modification of the composition-induced red shift. We observe non-equilibrium phonons that only exist near the interface and, furthermore, develop a novel technique to differentially map phonon momenta, providing direct evidence that the interplay between diffuse and specular reflection largely depends on the detailed atomistic structure: a major advancement in the field. Our work unveils the non-equilibrium phonon dynamics at nanoscale interfaces and can be used to study actual nanodevices and aid in the understanding of heat dissipation near nanoscale hotspots, which is crucial for future high-performance nanoelectronics.

Suggested Citation

  • Chaitanya A. Gadre & Xingxu Yan & Qichen Song & Jie Li & Lei Gu & Huaixun Huyan & Toshihiro Aoki & Sheng-Wei Lee & Gang Chen & Ruqian Wu & Xiaoqing Pan, 2022. "Nanoscale imaging of phonon dynamics by electron microscopy," Nature, Nature, vol. 606(7913), pages 292-297, June.
  • Handle: RePEc:nat:nature:v:606:y:2022:i:7913:d:10.1038_s41586-022-04736-8
    DOI: 10.1038/s41586-022-04736-8
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    Cited by:

    1. 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.
    2. Tom Lee & Ji Qi & Chaitanya A. Gadre & Huaixun Huyan & Shu-Ting Ko & Yunxing Zuo & Chaojie Du & Jie Li & Toshihiro Aoki & Ruqian Wu & Jian Luo & Shyue Ping Ong & Xiaoqing Pan, 2023. "Atomic-scale origin of the low grain-boundary resistance in perovskite solid electrolyte Li0.375Sr0.4375Ta0.75Zr0.25O3," Nature Communications, Nature, vol. 14(1), pages 1-14, December.
    3. Chung Il Park & Seungah Choe & Woorim Lee & Wonjae Choi & Miso Kim & Hong Min Seung & Yoon Young Kim, 2023. "Ultrasonic barrier-through imaging by Fabry-Perot resonance-tailoring panel," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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