Diverse electronic landscape of the kagome metal YbTi₃Bi₄

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2024年11月3日

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Anup Pradhan Sakhya,
Brenden R. Ortiz,
Barun Ghosh,
Milo Sprague,
Mazharul Islam Mondal,
Matthew Matzelle,
Iftakhar Bin Elius,
Nathan Valadez,
David G. Mandrus,
Arun Bansil,
Madhab Neupane

摘要

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 YbTi₃Bi₄ 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 YbTi₃Bi₄ and provide spectroscopic evidence of four flat bands. Our measurements also show the presence of multiple van Hove singularities originating from Ti 3d orbitals and a linearly-dispersing gapped Dirac-like bulk state at the $\overline{\,{\mbox{K}}\,}$ $\bar{K}$ point in accord with our theoretical calculations. Our study establishes YbTi₃Bi₄ as a platform for exploring exotic phases in the wider LnTi₃Bi₄ (Ln = lanthanide) family of materials.

Diverse electronic landscape of the kagome metal YbTi3Bi4

摘要

Diverse electronic landscape of the kagome metal YbTi₃Bi₄