In:
Nature Communications, Springer Science and Business Media LLC, Vol. 14, No. 1 ( 2023-08-14)
Abstract:
A representative class of kagome materials, AV 3 Sb 5 (A = K, Rb, Cs), hosts several unconventional phases such as superconductivity, $${{\mathbb{Z}}}_{2}$$ Z 2 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, ATi 3 Bi 5 (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 RbTi 3 Bi 5 . We demonstrate the coexistence of flat bands and several non-trivial states, including type-II Dirac nodal lines and $${{\mathbb{Z}}}_{2}$$ Z 2 non-trivial topological surface states. Our findings also provide evidence for rotational symmetry breaking in RbTi 3 Bi 5 , suggesting a directionality to the electronic structure and the possible emergence of pure electronic nematicity in this family of kagome compounds.
Type of Medium:
Online Resource
ISSN:
2041-1723
DOI:
10.1038/s41467-023-40515-3
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2023
detail.hit.zdb_id:
2553671-0
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