Observation of Topological Nodal-Ring Phonons in Monolayer Hexagonal Boron Nitride
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, exp...
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| Published in | Chinese physics letters Vol. 42; no. 2; pp. 27405 - 228 |
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| Main Authors | , , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Chinese Physical Society and IOP Publishing Ltd
01.02.2025
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| Online Access | Get full text |
| ISSN | 0256-307X 1741-3540 |
| DOI | 10.1088/0256-307X/42/2/027405 |
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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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| AbstractList | 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. |
| Author | Wang, Yani Su, Zhibin Guo, Jiandong Xue, Siwei Sun, Jiatao Peng, Hailin He, Shuyi Zhu, Xuetao Tao, Zhiyu Li, Jiade |
| Author_xml | – sequence: 1 givenname: Zhiyu surname: Tao fullname: Tao, Zhiyu organization: University of Chinese Academy of Sciences School of Physical Sciences, Beijing 100049, China – sequence: 2 givenname: Yani surname: Wang fullname: Wang, Yani organization: Beijing Graphene Institute , Beijing 100095, China – sequence: 3 givenname: Shuyi surname: He fullname: He, Shuyi organization: Beijing Institute of Technology School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing 100081, China – sequence: 4 givenname: Jiade surname: Li fullname: Li, Jiade organization: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China – sequence: 5 givenname: Siwei surname: Xue fullname: Xue, Siwei organization: Fuzhou University Department of Physics, Fuzhou 350108, China – sequence: 6 givenname: Zhibin surname: Su fullname: Su, Zhibin organization: University of Chinese Academy of Sciences School of Physical Sciences, Beijing 100049, China – sequence: 7 givenname: Jiatao surname: Sun fullname: Sun, Jiatao organization: Beijing Institute of Technology School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing 100081, China – sequence: 8 givenname: Hailin surname: Peng fullname: Peng, Hailin organization: Beijing Graphene Institute , Beijing 100095, China – sequence: 9 givenname: Jiandong surname: Guo fullname: Guo, Jiandong organization: University of Chinese Academy of Sciences School of Physical Sciences, Beijing 100049, China – sequence: 10 givenname: Xuetao surname: Zhu fullname: Zhu, Xuetao organization: University of Chinese Academy of Sciences School of Physical Sciences, Beijing 100049, China |
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| Title | Observation of Topological Nodal-Ring Phonons in Monolayer Hexagonal Boron Nitride |
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