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Article overview
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Physical properties, electronic structure, and strain-tuned monolayer of the weak topological insulator RbTi3Bi5 with Kagome lattice | Ying Zhou
; Long Chen
; Xuecong Ji
; Chen Liu
; Ke Liao
; Zhongnan Guo
; Jia'ou Wang
; Hongming Weng
; Gang Wang
; | Date: |
4 Jan 2023 | Abstract: | Kagome metals AV3Sb5 (A = K, Rb, and Cs) with a V-Kagome lattice acting as a
fertile platform to investigate geometric frustration, electron correlation,
superconductivity, and nontrivial band topology, have attracted tremendous
attention. Here we reported the structure and properties of ATi3Bi5 (A = Rb,
Cs) family with a Ti-Kagome lattice, specifically focusing on the electronic
structure and nontrivial band topology of RbTi3Bi5. ATi3Bi5 (A = Rb, Cs) is
found to be non-superconducting metal with strong quasi-two-dimensional
feature, moderate electron correlation, and small Pauli paramagnetism. Based on
first principles calculations, RbTi3Bi5 is determined to be a weak topological
insulator with gapless surface states along (100) plane, and the electronic
band structure along (001) plane is in great agreement with experimentally
observed one. In particular, the electronic properties of the RbTi3Bi5
monolayer can be efficiently tuned by a biaxial strain according to
calculation, with its lower saddle points coming from Kagome lattice
approaching the Fermi level. These results highlight ATi3Bi5 (A = Rb, Cs) with
Ti-Kagome lattice is a new Kagome metal to explore nontrivial band topology and
exotic phases. | Source: | arXiv, 2301.01633 | Services: | Forum | Review | PDF | Favorites |
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