Two elementary band representation model, Fermi surface nesting, and surface topological superconductivity in AV3Sb5 (A = K, Rb, Cs)
文献类型：期刊论文
| 作者 | Deng, Junze1,2; Zhang, Ruihan1,2; Xie, Yue1,2; Wu, Xianxin3; Wang, Zhijun1,2 |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 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 |
| 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. |
入库方式： OAI收割
来源：理论物理研究所
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