The magnetic kagome materials are a promising platform to study the interplay between magnetism, topology, and correlated electronic phenomena. Among these materials, the $R{\mathrm{Ti}}_3{\mathrm{Bi}}_4$ 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 ${\mathrm{TbTi}}_3{\mathrm{Bi}}_4$ 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.

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• Electronic structure
• Flat bands
• Magnetic phase transitions
• Surface states
• Topological phases of matter
• Kagome metal
• Angle-resolved photoemission spectroscopy
• Density functional calculations