Diverse electronic landscape of the kagome metal YbTi3Bi4

• Published in: Communications materials 2024-11, Vol.5 (1), p.241-7, Article 241
• Main Authors: Sakhya, Anup Pradhan, Ortiz, Brenden R., Ghosh, Barun, Sprague, Milo, Mondal, Mazharul Islam, Matzelle, Matthew, Bin Elius, Iftakhar, Valadez, Nathan, Mandrus, David G., Bansil, Arun, Neupane, Madhab
• Format: Article
• Language: English
• Subjects: 639/301/119/2792/4128; 639/766/119/2792/4128; Band spectra; Band theory; Bulk density; Chemistry and Materials Science; Density functional theory; Kagome lattice; Materials Science; Orbitals; Photoelectric emission; Quantum phenomena; Singularities; topological insulators
• ISSN: 2662-4443; 2662-4443
• DOI: 10.1038/s43246-024-00681-3

Kagome lattices have emerged as an ideal platform for exploring exotic quantum phenomena in materials. Here, we report the discovery of Ti-based kagome metal YbTi 3 Bi 4 which we characterize using angle-resolved photoemission spectroscopy (ARPES) and magneto-transport, in combination with density functional theory calculations. Our ARPES results reveal the complex fermiology of YbTi 3 Bi 4 and provide spectroscopic evidence of four flat bands. Our measurements also show the presence of multiple van Hove singularities originating from Ti 3 d orbitals and a linearly-dispersing gapped Dirac-like bulk state at the K ¯ point in accord with our theoretical calculations. Our study establishes YbTi 3 Bi 4 as a platform for exploring exotic phases in the wider L n Ti 3 Bi 4 ( L n  = lanthanide) family of materials. Kagome lattices have emerged as an ideal platform for exploring exotic quantum phenomena in materials. Here, the discovery of a Ti-based kagome metal YbTi 3 Bi 4 is reported, showing spectroscopic evidence of four flat bands originating from both Yb 4 f and Ti 3 d orbitals, multiple van Hove singularities, and a linearly dispersing gapped Dirac-like bulk state.