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学者姓名：薛思玮
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Abstract ：
Nonadiabatic effects profoundly influence lattice dynamics, resulting in phonon renormalizations not only at the center of Brillouin zone (BZ), but also across the entire dispersion at finite momenta. These nonadiabatic phenomena exhibit clear dimensional dependencies and remain largely unexplored experimentally in low-dimensional systems. Here, we utilize high-resolution electron energy loss spectroscopy to investigate nonadiabatic phonon dispersion renormalization in monolayer graphene (MLG) and Bernal bilayer graphene (BLG). We present comprehensive phonon spectra measurements for both MLG and BLG across the full BZ. The high-resolution data reveal an intriguing "W" -shaped dispersion for the longitudinal optical phonon in MLG and a "V" -shaped dispersion in BLG near the BZ center, in contrast to the conventional "U" -shaped parabolic dispersions. Combining theoretical analysis, these anomalous phonon renormalizations are demonstrated to originate from nonadiabatic electron-phonon couplings. The comparative study of MLG and BLG gives a generic understanding of the impact of nonadiabatic effects on phonon dispersions in doped two-dimensional systems.
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| GB/T 7714 | Li, J. , Tang, J. , Tao, Z. et al. Nonadiabatic Renormalization of the Phonon Dispersion in Monolayer and Bilayer Graphene [J]. | Physical review letters , 2025 , 135 (2) : 026204- . |
| MLA | Li, J. et al. "Nonadiabatic Renormalization of the Phonon Dispersion in Monolayer and Bilayer Graphene" . | Physical review letters 135 . 2 (2025) : 026204- . |
| APA | Li, J. , Tang, J. , Tao, Z. , Shi, R. , Gao, X. , Xue, S. et al. Nonadiabatic Renormalization of the Phonon Dispersion in Monolayer and Bilayer Graphene . | Physical review letters , 2025 , 135 (2) , 026204- . |
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Abstract ：
Topological physics has evolved from its initial focus on fermionic systems to the exploration of bosonic systems, particularly phononic excitations in crystalline materials. Two-dimensional (2D) topological phonons emerge as promising candidates for future technological applications. Currently, experimental verification of 2D topological phonons has remained exclusively limited to graphene, a constraint that hinders their applications in phononic devices. Here, we report experimental evidence of topological phonons in monolayer hexagonal boron nitride using advanced high-resolution electron energy loss spectroscopy. Our high-precision measurements explicitly demonstrate two topological nodal rings in monolayer hexagonal boron nitride, protected by mirror symmetry, expanding the paradigm of 2D topological phonons beyond graphene. This research not only deepens fundamental understanding of 2D topological phonons, but also establishes a phononic device platform based on wide-bandgap insulators, crucial for advancements in electronics and photonics applications.
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| GB/T 7714 | Tao, Zhiyu , Wang, Yani , He, Shuyi et al. Observation of Topological Nodal-Ring Phonons in Monolayer Hexagonal Boron Nitride [J]. | CHINESE PHYSICS LETTERS , 2025 , 42 (2) . |
| MLA | Tao, Zhiyu et al. "Observation of Topological Nodal-Ring Phonons in Monolayer Hexagonal Boron Nitride" . | CHINESE PHYSICS LETTERS 42 . 2 (2025) . |
| APA | Tao, Zhiyu , Wang, Yani , He, Shuyi , Li, Jiade , Xue, Siwei , Su, Zhibin et al. Observation of Topological Nodal-Ring Phonons in Monolayer Hexagonal Boron Nitride . | CHINESE PHYSICS LETTERS , 2025 , 42 (2) . |
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