Phonon transition across an isotopic interface

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 () and Peng Gao ()
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Ning Li: Peking University
Ruochen Shi: Peking University
Yifei Li: Peking University
Ruishi Qi: Peking University
Fachen Liu: Peking University
Xiaowen Zhang: Peking University
Zhetong Liu: Peking University
Yuehui Li: Peking University
Xiangdong Guo: CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Kaihui Liu: Peking University
Ying Jiang: Peking University
Xin-Zheng Li: Peking University
Ji Chen: Peking University
Lei Liu: Peking University
En-Ge Wang: Peking University
Peng Gao: Peking University

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Isotopic mixtures result in distinct properties of materials such as thermal conductivity and nuclear process. However, the knowledge of isotopic interface remains largely unexplored mainly due to the challenges in atomic-scale isotopic identification. Here, using electron energy-loss spectroscopy in a scanning transmission electron microscope, we reveal momentum-transfer-dependent phonon behavior at the h−10BN/h-11BN isotope heterostructure with sub-unit-cell resolution. We find the phonons’ energy changes gradually across the interface, featuring a wide transition regime. Phonons near the Brillouin zone center have a transition regime of ~3.34 nm, whereas phonons at the Brillouin zone boundary have a transition regime of ~1.66 nm. We propose that the isotope-induced charge effect at the interface accounts for the distinct delocalization behavior. Moreover, the variation of phonon energy between atom layers near the interface depends on both of momentum transfer and mass change. This study provides new insights into the isotopic effects in natural materials.

Date: 2023
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DOI: 10.1038/s41467-023-38053-z

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