Loop-current charge density wave driven by long-range Coulomb repulsion on the kagom? lattice
文献类型：期刊论文
| 作者 | Dong, Jin-Wei; Wang, Ziqiang2; Zhou, Sen1,3
|
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2023 |
| 卷号 | 107期号:4页码:45127 |
| ISSN号 | 2469-9950 |
| 关键词 | MODEL STATES PHASE |
| DOI | 10.1103/PhysRevB.107.045127 |
| 英文摘要 | Recent experiments on vanadium-based nonmagnetic kagome metals AV3Sb5 (A = K, Rb, Cs) revealed evidence for possible spontaneous time-reversal symmetry (TRS) breaking in the charge density wave (CDW) ordered state. The long-sought-after quantum order of loop currents has been suggested as a candidate for the TRS breaking state. However, a microscopic model for the emergence of the loop-current CDW due to electronic correlations is still lacking. Here, we calculate the susceptibility of the real and imaginary bond orders on the kagome lattice near van Hove filling, and reveal the importance of next-nearest-neighbor Coulomb repulsion V2 in triggering the instability toward imaginary bond ordered CDW. The concrete effective single-orbital t -V1 -V2 model on the kagome lattice is then studied, where t and V1 are the hopping and Coulomb repulsion on the nearest-neighbor bonds. We obtain the mean-field ground states, analyze their properties, and determine the phase diagram in the plane spanned by V1 and V2 at van Hove filling. The region dominated by V1 is occupied by a 2a0 x 2a0 real CDW insulator with the inverse of Star-of-David (ISD) bond configuration. Increasing V2 indeed drives a first-order transition from ISD to stabilized loop-current insulators that exhibit four possible current patterns of different topological properties, leading to orbital Chern insulators. We then extend these results away from van Hove filling and show that electron doping helps the stabilization of loop currents, and gives rise to doped orbital Chern insulators with emergent Chern Fermi pockets carrying large Berry curvature and orbital magnetic moment. Our findings provide a concrete model realization of the loop-current Chern metal at the mean-field level for the TRS breaking normal state of the kagome superconductors. |
| 学科主题 | Materials Science ; Physics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/28017]  |
| 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, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 3.Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA 4.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, Jin-Wei,Wang, Ziqiang,Zhou, Sen. Loop-current charge density wave driven by long-range Coulomb repulsion on the kagom? lattice[J]. PHYSICAL REVIEW B,2023,107(4):45127. |
| APA | Dong, Jin-Wei,Wang, Ziqiang,&Zhou, Sen.(2023).Loop-current charge density wave driven by long-range Coulomb repulsion on the kagom? lattice.PHYSICAL REVIEW B,107(4),45127. |
| MLA | Dong, Jin-Wei,et al."Loop-current charge density wave driven by long-range Coulomb repulsion on the kagom? lattice".PHYSICAL REVIEW B 107.4(2023):45127. |
入库方式： OAI收割
来源：理论物理研究所
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