Spin-1 Dirac-Weyl fermions protected by bipartite symmetry

被引:11
|
作者
Lin, Zeren [1 ,2 ]
Liu, Zhirong [1 ,3 ]
机构
[1] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
[2] Peking Univ, Sch Phys, Beijing 100871, Peoples R China
[3] Peking Univ, Beijing Natl Lab Mol Sci, Ctr Nanochem, Beijing 100871, Peoples R China
来源
JOURNAL OF CHEMICAL PHYSICS | 2015年 / 143卷 / 21期
基金
中国国家自然科学基金;
关键词
HUBBARD-MODEL; CLASSIFICATION; SEMIMETAL; GRAPHENE; SYSTEMS;
D O I
10.1063/1.4936774
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We propose that bipartite symmetry allows spin-1 Dirac-Weyl points, a generalization of the spin-1/2 Dirac points in graphene, to appear as topologically protected at the Fermi level. In this spirit, we provide methodology to construct spin-1 Dirac-Weyl points of this kind in a given 2D space group and get the classification of the known spin-1 systems in the literature. We also apply the workflow to predict two new systems, P3m1-9 and P31m-15, to possess spin-1 at K/K' in the Brillouin zone of hexagonal lattice. Their stability under various strains is investigated and compared with that of T-3, an extensively studied model of ultracold atoms trapped in optical lattice with spin-1 also at K/K'. (C) 2015 AIP Publishing LLC.
引用
收藏
页数:8
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