Flat bands, non-trivial band topology and rotation symmetry breaking in layered kagome-lattice RbTi(3)Bi(5).
Flat bands, non-trivial band topology and rotation symmetry breaking in layered kagome-lattice RbTi(3)Bi(5).
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DOI：
10.1038/s41467-023-40515-3
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发表时间：
2023-08-14
影响因子：
16.6
通讯作者：
Shen D
中科院分区：
文献类型：
--
作者：
Jiang Z;Liu Z;Ma H;Xia W;Liu Z;Liu J;Cho S;Yang Y;Ding J;Liu J;Huang Z;Qiao Y;Shen J;Jing W;Liu X;Liu J;Guo Y;Shen D
可果美材料的代表性类别，AV3Sb5（A = K，Rb，Cs），具有几个非常规相，如超导性，非平凡拓扑状态和电子自旋态。它们通常可以与相互缠绕的电荷密度波态共存。最近，发现的同质结构的钛基单晶，ATi3Bi5（A = K，Rb，Cs），表现出类似的多个奇异的状态，但没有伴随的电荷密度波，打开了一个机会，解开这些复杂的状态在kagome晶格。在这里，我们结合联合收割机高分辨率角分辨光电子能谱和第一性原理计算研究的低位电子结构的RbTi 3 Bi 5。我们证明了共存的平坦带和几个非平凡的状态，包括II型狄拉克节线和非平凡的拓扑表面状态。我们的研究结果还提供了证据的旋转对称性破缺的RbTi3Bi 5，这表明一个方向性的电子结构和可能出现的纯电子向列性在这个家庭的可果美化合物。Kagome超导体是一个平台，可以通过带拓扑介导交织的凝聚态现象。在这里，作者使用ARPES和DFT来识别第二类狄拉克节线，平坦带，拓扑非平凡的表面状态和向列性的可果美化合物RbTi3Bi5的签名。
A representative class of kagome materials, AV3Sb5 (A = K, Rb, Cs), hosts several unconventional phases such as superconductivity, non-trivial topological states, and electronic nematic states. These can often coexist with intertwined charge-density wave states. Recently, the discovery of the isostructural titanium-based single-crystals, ATi3Bi5 (A = K, Rb, Cs), which exhibit similar multiple exotic states but without the concomitant charge-density wave, has opened an opportunity to disentangle these complex states in kagome lattices. Here, we combine high-resolution angle-resolved photoemission spectroscopy and first-principles calculations to investigate the low-lying electronic structure of RbTi3Bi5. We demonstrate the coexistence of flat bands and several non-trivial states, including type-II Dirac nodal lines and non-trivial topological surface states. Our findings also provide evidence for rotational symmetry breaking in RbTi3Bi5, suggesting a directionality to the electronic structure and the possible emergence of pure electronic nematicity in this family of kagome compounds. Kagome superconductors are a platform for intertwined condensed matter phenomena that may be mediated by band topology. Here, authors use ARPES and DFT to identify type-II Dirac nodal lines, flat bands, topologically non-trivial surface states and signatures of nematicity in the kagome compound RbTi3Bi5.
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影响因子：
64.8
作者：
Guo, Chunyu;Putzke, Carsten;Konyzheva, Sofia;Huang, Xiangwei;Gutierrez-Amigo, Martin;Errea, Ion;Chen, Dong;Vergniory, Maia G.;Felser, Claudia;Fischer, Mark H.;Neupert, Titus;Moll, Philip J. W.
通讯作者：
Moll, Philip J. W.
影响因子：
3.7
作者：
Kresse, G;Furthmuller, J
通讯作者：
Furthmuller, J
影响因子：
19.6
作者：
Kang, Mingu;Fang, Shiang;Comin, Riccardo
通讯作者：
Comin, Riccardo
Kagome超导CsV3Sb5的双超导穹顶和高压下T-c的三重增强
影响因子：
8.6
作者：
Chen, K. Y.;Wang, N. N.;Cheng, J-G
通讯作者：
Cheng, J-G
影响因子：
8.6
作者：
Jiang, H. C.;Weng, Z. Y.;Sheng, D. N.
通讯作者：
Sheng, D. N.