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Based on first-principles calculation and effective model analysis, we propose that the cubic antiperovskite material Cu3PdN can host a three-dimensional (3D) topological node-line semimetal state when spin-orbit coupling (SOC) is ignored, which is protected by the coexistence of time-reversal and inversion symmetry. There are three node-line circles in total due to the cubic symmetry. Drumheadlike surface flat bands are also derived. When SOC is included, each node line evolves into a pair of stable 3D Dirac points as protected by C4 crystal symmetry. This is remarkably distinguished from the Dirac semimetals known so far, such as Na3Bi and Cd3As2, both having only one pair of Dirac points. Once C4 symmetry is broken, the Dirac points are gapped and the system becomes a strong topological insulator with (1;111) Z2 indices.

権利情報:

• In Copyright
  

キーワード: topological phase, Dirac semimetal, nodal line, antiperovskite

刊行年月日: 2015-07-17

出版者: American Physical Society

掲載誌:

• Physical Review Letters (ISSN: 00319007) vol. 115 issue. 3 036807

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1103/PhysRevLett.115.036807

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更新時刻: 2024-01-05 22:12:09 +0900

MDRでの公開時刻: 2023-04-28 10:17:36 +0900