Diverse electronic landscape of the kagome metal YbTi3Bi4

TL;DR

This paper reports the discovery and detailed electronic characterization of the kagome metal YbTi3Bi4, revealing complex electronic features and establishing it as a platform for exploring exotic quantum phases.

Contribution

It introduces YbTi3Bi4 as a new kagome metal with unique electronic properties, supported by ARPES, magneto-transport, and theoretical calculations.

Findings

Identification of four flat bands in YbTi3Bi4

Observation of multiple van Hove singularities from Ti 3d orbitals

Detection of a gapped Dirac-like bulk state at the K point

Abstract

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 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.