Multi-Weyl Topological Semimetals Stabilized by Point Group Symmetry

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	Multi-Weyl Topological Semimetals Stabilized by Point Group Symmetry
	Fang, C ; Gilbert, MJ ; Dai, X ; Bernevig, BA
刊名	PHYSICAL REVIEW LETTERS
	2012
卷号	108 期号:26
ISSN号	0031-9007
通讯作者	Fang, C: Princeton Univ, Dept Phys, Princeton, NJ 08544 USA.
中文摘要	We perform a complete classification of two-band k . p theories at band crossing points in 3D semimetals with n-fold rotation symmetry and broken time-reversal symmetry. Using this classification, we show the existence of new 3D topological semimetals characterized by C-4,C-6-protected double-Weyl nodes with quadratic in-plane (along k(x,y)) dispersion or C-6-protected triple-Weyl nodes with cubic in-plane dispersion. We apply this theory to the 3D ferromagnet HgCr2Se4 and confirm it is a double-Weyl metal protected by C-4 symmetry. Furthermore, if the direction of the ferromagnetism is shifted away from the [001] axis to the [111] axis, the double-Weyl node splits into four single Weyl nodes, as dictated by the point group S-6 of that phase. Finally, we discuss experimentally relevant effects including the splitting of multi-Weyl nodes by applying a C-n breaking strain and the surface Fermi arcs in these new semimetals.
收录类别	SCI
资助信息	ONR [N0014-11-1-0728, N00014-11-1-0635]; AFOSR [FA9550-10-1-0459]; NSF [DMR-095242]; Darpa [N66001-11-1-4110]; David and Lucile Packard Foundation; NSF China; 973 Program of China [2011CBA00108]
语种	英语
公开日期	2013-09-18
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/42435]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Fang, C,Gilbert, MJ,Dai, X,et al. Multi-Weyl Topological Semimetals Stabilized by Point Group Symmetry[J]. PHYSICAL REVIEW LETTERS,2012,108(26).
APA	Fang, C,Gilbert, MJ,Dai, X,&Bernevig, BA.(2012).Multi-Weyl Topological Semimetals Stabilized by Point Group Symmetry.PHYSICAL REVIEW LETTERS,108(26).
MLA	Fang, C,et al."Multi-Weyl Topological Semimetals Stabilized by Point Group Symmetry".PHYSICAL REVIEW LETTERS 108.26(2012).