Nature communications · 2025
Pomeranchuk instability from electronic correlations in CsTi3Bi5 kagome metal.
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Bigi Chiara, Dürrnagel Matteo, Klebl Lennart, Consiglio Armando, Pokharel Ganesh, Zonno Marta, Bertran François, Le Fèvre Patrick, Jaouen Thomas, Tchouekem Hulerich C, Turban Pascal, De Vita Alessandro, Miwa Jill A, Wells Justin W, Oh Dongjin, Comin Riccardo, Thomale Ronny, Zeljkovic Ilija, Ortiz Brenden R, Wilson Stephen D, Sangiovanni Giorgio, Mazzola Federico, Di Sante Domenico
Аннотация
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.