Measuring phonon dispersion at an interface
文献类型：期刊论文
| 作者 | Qi, Ruishi10,11,12; Shi, Ruochen11,12; Li, Yuehui11,12; Sun, Yuanwei11,12; Wu, Mei11,12; Li, Ning9,11,12; Du, Jinlong12; Liu, Kaihui6,7,8; Chen, Chunlin5; Chen, Ji8 |
| 刊名 | NATURE
 |
| 出版日期 | 2021-11-18 |
| 卷号 | 599期号:7885页码:399-+ |
| ISSN号 | 0028-0836 |
| DOI | 10.1038/s41586-021-03971-9 |
| 通讯作者 | Gao, Peng(p-gao@pku.edu.cn) |
| 英文摘要 | 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. |
| WOS研究方向 | Science & Technology - Other Topics |
| 语种 | 英语 |
| WOS记录号 | WOS:000720055600019 |
| 出版者 | NATURE PORTFOLIO |
| 源URL | [http://ir.imr.ac.cn/handle/321006/167490]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Gao, Peng |
| 作者单位 | 1.Beijing Graphene Inst, Beijing, Peoples R China 2.Liaoning Univ, Sch Phys, Shenyang, Peoples R China 3.Chinese Acad Sci, Inst Phys, Songshan Lake Mat Lab, Dongguan, Peoples R China 4.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn SIQSE, Shenzhen, Peoples R China 5.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang, Peoples R China 6.Peking Univ, Ctr Light Element Adv Mat, Interdisciplinary Inst Light Element Quantum Mat, Beijing, Peoples R China 7.Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China 8.Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing, Peoples R China 9.Peking Univ, Acad Adv Interdisciplinary Studies, Beijing, Peoples R China 10.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA |
| 推荐引用方式 GB/T 7714 | Qi, Ruishi,Shi, Ruochen,Li, Yuehui,et al. Measuring phonon dispersion at an interface[J]. NATURE,2021,599(7885):399-+. |
| APA | Qi, Ruishi.,Shi, Ruochen.,Li, Yuehui.,Sun, Yuanwei.,Wu, Mei.,...&Gao, Peng.(2021).Measuring phonon dispersion at an interface.NATURE,599(7885),399-+. |
| MLA | Qi, Ruishi,et al."Measuring phonon dispersion at an interface".NATURE 599.7885(2021):399-+. |
入库方式： OAI收割
来源：金属研究所
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