期刊论文

英文

PHYSICAL REVIEW B

2469-9950

2023

107

13

134104

10.1103/PhysRevB.107.134104

National Natural Sci- ence Foundation of China [11804287, 11872054]; Hunan Provincial Natural Science Foundation of China [2019JJ50577, 2021JJ30686, 2022JJ40008, 2020JJ2026]; Scientific Research Fund of Hunan Provincial Education Department [21C0549]; Postgraduate Scientific Research Innovation Project of Hunan Province [QL20210143]; Postgraduate Scientific Research Innovation Project of Xiang-tan University [XDCX2021B131]

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Second-order topological phases in artificial systems have been extensively studied, but studies in the phonons of atomic materials are limited. In this paper, we propose that phononic second-order topological phase exists in C3N , a previously synthesized and intensively investigated two-dimensional material. Its nontrivial phase arises from the mismatch between the Wannier centers of the out-of-plane phonon modes and the atomic positions. Using a simplified force constant model, we find that gapped edge modes and in-gap corner modes only exist on the structures with broken pure-carbon-ring t...