Two elementary band representation model, Fermi surface nesting, and surface topological superconductivity in AV3Sb5 (A = K, Rb, Cs)

doi:10.1103/PhysRevB.108.115123

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	Two elementary band representation model, Fermi surface nesting, and surface topological superconductivity in AV3Sb5 (A = K, Rb, Cs)
	Deng, Junze 1,2; Zhang, Ruihan 1,2; Xie, Yue 1,2; Wu, Xianxin 3; Wang, Zhijun 1,2
刊名	PHYSICAL REVIEW B
	2023
卷号	108 期号:11 页码:115123
关键词	VAN-HOVE SINGULARITIES WAVE STATE
ISSN号	2469-9950
DOI	10.1103/PhysRevB.108.115123
英文摘要	The recently discovered vanadium-based Kagome metals AV3Sb5 (A = K, Rb, Cs) are of great interest with the interplay of charge density wave (CDW) order, band topology and superconductivity. In this paper, by identifying elementary band representations (EBRs), we construct a two-EBR graphene-Kagome model to capture the two low-energy van-Hove-singularity dispersions and, more importantly, the nontrivial band topology in these Kagome metals. This model consists of Ag@3g (V-dx2-y2/z2, Kagome sites) and A 2@2d EBRs (Sb1-pz, honeycomb sites). We have investigated the Fermi surface instability by calculating the electronic susceptibility chi(q). Prominent Fermi-surface nesting peaks are obtained at three L points, where the z component of the nesting vector shows an intimate relationship with the anticrossing point along M-L. The nesting peaks at L are consistent with the 2 x 2 x 2 CDW reconstruction in these compounds. In addition, the sublattice-resolved bare susceptibility is calculated and similar sharp peaks are observed at the L points, indicating a strong antiferromagnetic fluctuation. Assuming a bulk s-wave superconducting pairing, the helical surface states and nontrivial superconducting gap are obtained on the (001) surface. Analogous to the FeTe1-xSex superconductor, our results establish another material realization of a stoichiometric superconductor with nontrivial band topology, providing a promising platform for studying exotic Majorana physics in condensed matter.
学科主题	Materials Science ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/28101]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Deng, Junze,Zhang, Ruihan,Xie, Yue,et al. Two elementary band representation model, Fermi surface nesting, and surface topological superconductivity in AV3Sb5 (A = K, Rb, Cs)[J]. PHYSICAL REVIEW B,2023,108(11):115123.
APA	Deng, Junze,Zhang, Ruihan,Xie, Yue,Wu, Xianxin,&Wang, Zhijun.(2023).Two elementary band representation model, Fermi surface nesting, and surface topological superconductivity in AV3Sb5 (A = K, Rb, Cs).PHYSICAL REVIEW B,108(11),115123.
MLA	Deng, Junze,et al."Two elementary band representation model, Fermi surface nesting, and surface topological superconductivity in AV3Sb5 (A = K, Rb, Cs)".PHYSICAL REVIEW B 108.11(2023):115123.