Observation of Topological Nodal-Ring Phonons in Monolayer Hexagonal Boron Nitride - Details

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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.　©　2025　Chinese　Physical　Society　and　IOP　Publishing　Ltd.　All　rights,　including　for　text　and　data　mining,　AI　training,　and　similar　technologies,　are　reserved.

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[ 1 ] [Tao Z.]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
[ 2 ] [Tao Z.]School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
[ 3 ] [Wang Y.]Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
[ 4 ] [Wang Y.]Beijing Graphene Institute, Beijing, 100095, China
[ 5 ] [He S.]School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, Beijing, 100081, China
[ 6 ] [Li J.]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
[ 7 ] [Xue S.]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
[ 8 ] [Xue S.]Department of Physics, Fuzhou University, Fuzhou, 350108, China
[ 9 ] [Su Z.]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
[ 10 ] [Su Z.]School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
[ 11 ] [Sun J.]School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, Beijing, 100081, China
[ 12 ] [Peng H.]Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
[ 13 ] [Peng H.]Beijing Graphene Institute, Beijing, 100095, China
[ 14 ] [Guo J.]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
[ 15 ] [Guo J.]School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
[ 16 ] [Zhu X.]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
[ 17 ] [Zhu X.]School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China

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Chinese Physics Letters

ISSN： 0256-307X

Year： 2025

Issue： 2

Volume： 42

3 . 5 0 0

JCR@2023

CAS Journal Grade：1

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ESI Highly Cited Papers on the List： 0 Unfold All

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