Emergence of New van Hove Singularities in the Charge Density Wave State of a Topological Kagome MetalRbV3Sb5,Physical Review Letters

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Emergence of New van Hove Singularities in the Charge Density Wave State of a Topological Kagome MetalRbV3Sb5
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-12-01 , DOI: 10.1103/physrevlett.127.236401
Soohyun Cho ₁ , Haiyang Ma _{2,

3} , Wei Xia _{2,

4} , Yichen Yang ₁ , Zhengtai Liu ₁ , Zhe Huang ₁ , Zhicheng Jiang ₁ , Xiangle Lu _{1,

5} , Jishan Liu _{1,

5} , Zhonghao Liu _{1,

5} , Jun Li _{2,

4} , Jinghui Wang _{2,

4} , Yi Liu ₆ , Jinfeng Jia ₃ , Yanfeng Guo ₂ , Jianpeng Liu _{2,

4} , Dawei Shen _{1,

5}

Affiliation

Quantum materials with layered kagome structures have drawn considerable attention due to their unique lattice geometry, which gives rise to flat bands together with Dirac-like dispersions. Recently, vanadium-based materials with layered kagome structures were discovered to be topological metals, which exhibit charge density wave (CDW) properties, significant anomalous Hall effect, and unusual superconductivity at low temperatures. Here, we employ angle-resolved photoemission spectroscopy to investigate the electronic structure evolution upon the CDW transition in a vanadium-based kagome material

{RbV}_{3} {Sb}_{5}

. The CDW phase transition gives rise to a partial energy gap opening at the boundary of the Brillouin zone and, most importantly, the emergence of new van Hove singularities associated with large density of states, which are absent in the normal phase and might be related to the superconductivity observed at lower temperatures. Our work sheds light on the microscopic mechanisms for the formation of the CDW and superconducting states in these topological kagome metals.

中文翻译：

拓扑 Kagome MetalRbV3Sb5 电荷密度波态中新范霍夫奇点的出现

具有分层 kagome 结构的量子材料由于其独特的晶格几何形状而引起了相当大的关注，这会产生平带和类狄拉克色散。最近，具有层状kagome结构的钒基材料被发现是拓扑金属，其表现出电荷密度波（CDW）特性、显着的异常霍尔效应和低温下不寻常的超导性。在这里，我们采用角分辨光电子能谱来研究钒基 Kagome 材料中 CDW 跃迁时的电子结构演变