Two-dimensional topological semimetal states in monolayer Cu2Ge, Fe2Ge, and Fe2Sn

doi:10.1103/PhysRevB.101.165403

IMR OpenIR

	Two-dimensional topological semimetal states in monolayer Cu2Ge, Fe2Ge, and Fe2Sn
	Liu, Liangliang; Wang, Chongze; Li, Jiangxu; Chen, Xing-Qiu; Jia, Yu; Cho, Jun-Hyung
	2020-04-06
Source Publication	PHYSICAL REVIEW B
Volume	101 Issue:16
Abstract	Recent experimental realizations of the topological semimetal states in several monolayer systems are very attractive because of their exotic quantum phenomena and technological applications. Based on first-principles density-functional theory calculations including spin-orbit coupling, we here explore the drastically different two-dimensional (2D) topological semimetal states in three monolayers, Cu2Ge, Fe2Ge, and Fe2Sn, which are isostructural with a combination of the honeycomb Cu or Fe lattice and the triangular Ge or Sn lattice. We find that (i) the nonmagnetic (NM) Cu2Ge monolayer with a planar geometry exhibits the massive Dirac nodal lines, (ii) the ferromagnetic (FM) Fe2Ge monolayer with a buckled geometry exhibits the massive Weyl points, and (iii) the FM Fe2Sn monolayer with a planar geometry and an out-of-plane magnetic easy axis exhibits the massless Weyl nodal lines. It is therefore revealed that mirror symmetry cannot protect the fourfold-degenerate Dirac nodal lines in the NM Cu2Ge monolayer but preserves the doubly degenerate Weyl nodal lines in the FM Fe2Sn monolayer. Our findings demonstrate that the interplay of crystal symmetry, magnetic easy axis, and band topology is of importance for tailoring various 2D topological states in Cu2Ge, Fe2Ge, and Fe2Sn monolayers.
DOI	10.1103/PhysRevB.101.165403
WOS ID	WOS:000523630200009
Citation statistics
Document Type	期刊论文
Identifier	http://ir.imr.ac.cn/handle/321006/82963
Collection	中国科学院金属研究所
Recommended Citation GB/T 7714	Liu, Liangliang,Wang, Chongze,Li, Jiangxu,et al. Two-dimensional topological semimetal states in monolayer Cu2Ge, Fe2Ge, and Fe2Sn[J]. PHYSICAL REVIEW B,2020,101(16).
APA	Liu, Liangliang,Wang, Chongze,Li, Jiangxu,Chen, Xing-Qiu,Jia, Yu,&Cho, Jun-Hyung.(2020).Two-dimensional topological semimetal states in monolayer Cu2Ge, Fe2Ge, and Fe2Sn.PHYSICAL REVIEW B,101(16).
MLA	Liu, Liangliang,et al."Two-dimensional topological semimetal states in monolayer Cu2Ge, Fe2Ge, and Fe2Sn".PHYSICAL REVIEW B 101.16(2020).

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