Observation of unexpected band splitting and magnetically-induced band structure reconstruction in TbTi$_3$Bi$_4$

TL;DR

This study reveals unexpected band splitting and complex band structure reconstruction in TbTi3Bi4, a magnetic Kagome material, using ARPES and DFT, highlighting novel electronic phenomena linked to magnetic phases.

Contribution

It reports the discovery of unanticipated band splitting and complex band structure changes in TbTi3Bi4 across magnetic phases, advancing understanding of magnetic topological materials.

Findings

Unidirectional band splitting observed in both phases

Complex band reconstruction in the antiferromagnetic phase

Some features linked to magnetic ordering effects

Abstract

The magnetic Kagome materials are a promising platform to study the interplay between magnetism, topology, and correlated electronic phenomena. Among these materials, the RTi3Bi4 family received a great deal of attention recently because of its chemical versatility and wide range of magnetic properties. Here, we use angle-resolved photoemission spectroscopy measurements and density functional theory calculations to investigate the electronic structure of TbTi3Bi4 in paramagnetic and antiferromagnetic phases. Our experimental results show the presence of unidirectional band splitting of unknown nature in both phases. In addition, we observed a complex reconstruction of the band structure in the antiferromagnetic phase. Some aspects of this reconstruction are consistent with effects of additional periodicity introduced by the magnetic ordering vector, while the nature of several other features remains unknown.