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

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外文摘要：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 P41212 space group.Furthermore,we propose GeO2 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.

外文关键词：

topological phononWeyl pointsDirac points

作者：

何东昌、刘嘉希、刘培涛、李江旭、陈星秋

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作者单位：

Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China

基金：

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNetwork and Information Foundation of CASKey Project of Chinese Academy of SciencesChina Postdoctoral Science FoundationChina Postdoctoral Science Foundation

项目编号：

2021YFB350150351474202CAS-WX2021SF-0102ZDRW-CN-2021-2-52022T1506602021M700152

出版年：

2024

DOI：

10.1088/1674-1056/ad6a08

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

年,卷(期)：2024.33(10)