Mapping Distorted Kagome Metals | Dr Sakhya Anup Pradhan | Seminar

Quantum materials featuring a kagome lattice, in which corner-sharing triangles form a hexagonal framework, provide a unique platform to explore the interplay between lattice geometry, electron correlations, and spin interactions, and have attracted considerable attention in recent years. In this talk, I will introduce LnTi₃Bi₄ (Ln = lanthanide), a novel family of distorted kagome metals that has drawn interest due to the combination of highly anisotropic magnetism and a rich electronic structure. I will present a comparative ARPES and DFT study of several members of this series, highlighting their diverse yet interconnected electronic phenomena. In YbTi₃Bi₄, NdTi₃Bi₄, and LaTi₃Bi₄, we directly observe multiple van Hove singularities near the Fermi level, linearly dispersing Dirac-like states, and flat bands arising from destructive interference within the Ti-based kagome network. These features are accompanied by strong electronic anisotropy, reflecting the broken sixfold rotational symmetry inherent to the distorted kagome lattice. I will also briefly discuss CeTi₃Bi₄, where the Ti kagome electronic structure couples to localized Ce³⁺ moments, giving rise to a rich magnetic phase diagram including a spin-density-wave ground state. Together, these results establish LnTi₃Bi₄ as a versatile model system in which flat-band physics, Dirac topology, Fermi-surface instabilities, and magnetism can be systematically explored within a single materials family.