Single pair of charge-2 Dirac and charge-2 Weyl phonons in GeO2

doi:10.1088/1674-1056/ad6a08

中国物理B ›› 2024, Vol. 33 ›› Issue (10): 100301-100301.doi: 10.1088/1674-1056/ad6a08

Single pair of charge-2 Dirac and charge-2 Weyl phonons in GeO₂

Dong-Chang He(何东昌)^1,2, Jia-Xi Liu(刘嘉希)^1,2, Pei-Tao Liu(刘培涛)¹, Jiang-Xu Li(李江旭)^1,†, and Xing-Qiu Chen(陈星秋)^1,‡

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

收稿日期:2024-05-21 修回日期:2024-07-19 接受日期:2024-08-01 出版日期:2024-10-15 发布日期:2024-10-15
通讯作者: Jiang-Xu Li, Xing-Qiu Chen E-mail:jxli15s@imr.ac.cn;xingqiu.chen@imr.ac.cn
基金资助:
Project supported by the National Key R&D Program of China (Grant No. 2021YFB3501503), the National Natural Science Foundation of China (Grant No. 51474202), Network and Information Foundation of CAS (Grant No. CAS-WX2021SF-0102), and the Key Project of Chinese Academy of Sciences (Grant No. ZDRW-CN-2021-2-5). J. X. Li also acknowledges the funding from China Postdoctoral Science Foundation (Grant Nos. 2022T150660 and 2021M700152).

Single pair of charge-2 Dirac and charge-2 Weyl phonons in GeO₂

Dong-Chang He(何东昌)^1,2, Jia-Xi Liu(刘嘉希)^1,2, Pei-Tao Liu(刘培涛)¹, Jiang-Xu Li(李江旭)^1,†, and Xing-Qiu Chen(陈星秋)^1,‡

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Received:2024-05-21 Revised:2024-07-19 Accepted:2024-08-01 Online:2024-10-15 Published:2024-10-15
Contact: Jiang-Xu Li, Xing-Qiu Chen E-mail:jxli15s@imr.ac.cn;xingqiu.chen@imr.ac.cn
Supported by:
Project supported by the National Key R&D Program of China (Grant No. 2021YFB3501503), the National Natural Science Foundation of China (Grant No. 51474202), Network and Information Foundation of CAS (Grant No. CAS-WX2021SF-0102), and the Key Project of Chinese Academy of Sciences (Grant No. ZDRW-CN-2021-2-5). J. X. Li also acknowledges the funding from China Postdoctoral Science Foundation (Grant Nos. 2022T150660 and 2021M700152).

摘要/Abstract

摘要： The presence of a pair of Weyl and Dirac points (WP-DP) in topological semimetal states is intriguing and sought after due to the effects associated with chiral topological charges. However, identifying these states in real materials poses a significant challenge. In this study, by means of first-principles calculations we predict the coexistence of charge-2 Dirac and charge-2 Weyl phonons at high-symmetry points within a noncentrosymmetric $P4_12_12$ space group. Furthermore, we propose GeO$_2$ as an ideal candidate for realizing these states. Notably, we observe two distinct surface arcs that connect the Dirac and Weyl points across the entire Brillouin zone, which could facilitate their detection in future experimental investigations. This study not only presents a tangible material for experimentalists to explore the topological properties of WP-DP states but also opens up new avenues in the quest for ideal platforms to study chiral particles.

关键词: topological phonon, Weyl points, Dirac points

Abstract: The presence of a pair of Weyl and Dirac points (WP-DP) in topological semimetal states is intriguing and sought after due to the effects associated with chiral topological charges. However, identifying these states in real materials poses a significant challenge. In this study, by means of first-principles calculations we predict the coexistence of charge-2 Dirac and charge-2 Weyl phonons at high-symmetry points within a noncentrosymmetric $P4_12_12$ space group. Furthermore, we propose GeO$_2$ as an ideal candidate for realizing these states. Notably, we observe two distinct surface arcs that connect the Dirac and Weyl points across the entire Brillouin zone, which could facilitate their detection in future experimental investigations. This study not only presents a tangible material for experimentalists to explore the topological properties of WP-DP states but also opens up new avenues in the quest for ideal platforms to study chiral particles.

Key words: topological phonon, Weyl points, Dirac points

中图分类号: (Phases: geometric; dynamic or topological)

03.65.Vf

Dong-Chang He(何东昌), Jia-Xi Liu(刘嘉希), Pei-Tao Liu(刘培涛), Jiang-Xu Li(李江旭), and Xing-Qiu Chen(陈星秋). Single pair of charge-2 Dirac and charge-2 Weyl phonons in GeO₂[J]. 中国物理B, 2024, 33(10): 100301-100301.

Dong-Chang He(何东昌), Jia-Xi Liu(刘嘉希), Pei-Tao Liu(刘培涛), Jiang-Xu Li(李江旭), and Xing-Qiu Chen(陈星秋). Single pair of charge-2 Dirac and charge-2 Weyl phonons in GeO₂[J]. Chin. Phys. B, 2024, 33(10): 100301-100301.

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Single pair of charge-2 Dirac and charge-2 Weyl phonons in GeO₂

Single pair of charge-2 Dirac and charge-2 Weyl phonons in GeO₂

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