Pomeranchuk instability from electronic correlations in CsTi3Bi5 kagome metal
Résumé
Electronic nematicity, the spontaneous breaking of rotational symmetry, has emerged as a key instability in correlated quantum systems. CsTi3Bi5, a kagome metal of the AV3Sb5 (A = K, Rb, Cs) family, hosts rich unconventional electronic phases, yet the origin of its nematicity remains unsettled. Here, we combine polarization-dependent angle-resolved photoemission spectroscopy with functional renormalization group calculations on a fully interacting ab initio model. We reveal an orbital-selective nematic deformation in the low-energy band structure and identify a finite angular momentum (d-wave) Pomeranchuk instability driven by electronic correlations in specific orbital channels and detuning from Van Hove singularities. Our results establish a direct link between orbital selectivity and symmetry-breaking instabilities in CsTi3Bi5, providing a microscopic framework for nematic order in kagome systems.
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Cite 10.5281/zenodo.17641745 Jeu de données Di Sante, D. (2025). Pomeranchuk instability from electronic correlations in CsTi3Bi5 kagome metal [Data set]. Zenodo. https://doi.org/10.5281/ZENODO.17641745