Measuring phonon dispersion at an interface

Qi, Ruishi1,2,3; Shi, Ruochen1,2; Li, Yuehui1,2; Sun, Yuanwei1,2; Wu, Mei1,2; Li, Ning1,2,4; Du, Jinlong1; Liu, Kaihui5,6,7; Chen, Chunlin8; Chen, Ji5; Wang, Feng3; Yu, Dapeng1,9; Wang, En-Ge2,10,11; Gao, Peng1,2,6,7,12

2021-11-18

10.1038/s41586-021-03971-9

NATURE   影响因子和分区

0028-0836

1476-4687

["Four-dimensional electron energy-loss spectroscopy measurements of the vibrational spectra and the phonon dispersion at a heterointerface show localized modes that are predicted to affect the thermal conductance and electron mobility.","The breakdown of translational symmetry at heterointerfaces leads to the emergence of new phonon modes localized at the interface(1). 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 device(2). Although related theoretical work began decades ago(1,3-5), 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."]

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Multidisciplinary Sciences

WOS:000720055600019

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Web of Science

1.Peking Univ, Sch Phys, Electron Microscopy Lab, Beijing, Peoples R China
2.Peking Univ, Int Ctr Quantum Mat, Beijing, Peoples R China
3.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
4.Peking Univ, Acad Adv Interdisciplinary Studies, Beijing, Peoples R China
5.Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing, Peoples R China
6.Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China
7.Peking Univ, Ctr Light Element Adv Mat, Interdisciplinary Inst Light Element Quantum Mat, Beijing, Peoples R China
8.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang, Peoples R China
9.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn SIQSE, Shenzhen, Peoples R China
10.Chinese Acad Sci, Inst Phys, Songshan Lake Mat Lab, Dongguan, Peoples R China
11.Liaoning Univ, Sch Phys, Shenyang, Peoples R China
12.Beijing Graphene Inst, Beijing, Peoples R China

Qi, Ruishi,Shi, Ruochen,Li, Yuehui,et al. Measuring phonon dispersion at an interface[J]. NATURE,2021,599(7885).

Qi, Ruishi.,Shi, Ruochen.,Li, Yuehui.,Sun, Yuanwei.,Wu, Mei.,...&Gao, Peng.(2021).Measuring phonon dispersion at an interface.NATURE,599(7885).

Qi, Ruishi,et al."Measuring phonon dispersion at an interface".NATURE 599.7885(2021).