Graphene-like Be3X2 (X=C, Si, Ge, Sn): A new family of two-dimensional topological insulators

doi:10.1088/1674-1056/28/3/037101

中国物理B ›› 2019, Vol. 28 ›› Issue (3): 37101-037101.doi: 10.1088/1674-1056/28/3/037101

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Graphene-like Be₃X₂ (X=C, Si, Ge, Sn): A new family of two-dimensional topological insulators

Lingling Song(宋玲玲), Lizhi Zhang(张礼智), Yurou Guan(官雨柔), Jianchen Lu(卢建臣), Cuixia Yan(闫翠霞), Jinming Cai(蔡金明)

1 Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2018-11-05 修回日期:2018-12-20 出版日期:2019-03-05 发布日期:2019-03-05
通讯作者: Cuixia Yan, Jinming Ca E-mail:j.cai@kmsut.edu;cuixiayan09@gmail.com

Graphene-like Be₃X₂ (X=C, Si, Ge, Sn): A new family of two-dimensional topological insulators

Lingling Song(宋玲玲)¹, Lizhi Zhang(张礼智)², Yurou Guan(官雨柔)¹, Jianchen Lu(卢建臣)¹, Cuixia Yan(闫翠霞)¹, Jinming Cai(蔡金明)¹

1 Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2018-11-05 Revised:2018-12-20 Online:2019-03-05 Published:2019-03-05
Contact: Cuixia Yan, Jinming Ca E-mail:j.cai@kmsut.edu;cuixiayan09@gmail.com

摘要/Abstract

摘要：

Using first-principle calculations, we predict a new family of stable two-dimensional (2D) topological insulators (TI), monolayer Be₃X₂ (X=C, Si, Ge, Sn) with honeycomb Kagome lattice. Based on the configuration of Be₃C₂, which has been reported to be a 2D Dirac material, we construct the other three 2D materials and confirm their stability according to their chemical bonding properties and phonon-dispersion relationships. Because of their tiny spin-orbit coupling (SOC) gaps, Be₃C₂ and Be₃Si₂ are 2D Dirac materials with high Fermi velocity at the same order of magnitude as that of graphene. For Be₃Ge₂ and Be₃Sn₂, the SOC gaps are 1.5 meV and 11.7 meV, and their topological nontrivial properties are also confirmed by their semi-infinite Dirac edge states. Our findings not only extend the family of 2D Dirac materials, but also open an avenue to track new 2DTI.

关键词: Dirac materials, topological insulator, first-principles calculation, spin-orbit coupling

Abstract:

Key words: Dirac materials, topological insulator, first-principles calculation, spin-orbit coupling

中图分类号: (Density functional theory, local density approximation, gradient and other corrections)

71.15.Mb

73.20.At (Surface states, band structure, electron density of states)

宋玲玲, 张礼智, 官雨柔, 卢建臣, 闫翠霞, 蔡金明. Graphene-like Be₃X₂ (X=C, Si, Ge, Sn): A new family of two-dimensional topological insulators[J]. 中国物理B, 2019, 28(3): 37101-037101.

Lingling Song(宋玲玲), Lizhi Zhang(张礼智), Yurou Guan(官雨柔), Jianchen Lu(卢建臣), Cuixia Yan(闫翠霞), Jinming Cai(蔡金明). Graphene-like Be₃X₂ (X=C, Si, Ge, Sn): A new family of two-dimensional topological insulators[J]. Chin. Phys. B, 2019, 28(3): 37101-037101.

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Graphene-like Be₃X₂ (X=C, Si, Ge, Sn): A new family of two-dimensional topological insulators

Graphene-like Be₃X₂ (X=C, Si, Ge, Sn): A new family of two-dimensional topological insulators

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