Chiara Bigi, Matteo Dürrnagel, Lennart Klebl, Armando Consiglio, Ganesh Pokharel, Marta Zonno, François Bertran, Patrick Le Fèvre, T. Jaouen, Hulerich Camel Tchouekem, Pascal Turban, Alessandro De Vita, Jill A. Miwa, Justin W. Wells, Dongjin Oh, Riccardo Comin, Ronny Thomale, Ilija Zeljkovic, Brenden R. Ortiz, S. D. Wilson, Giorgio Sangiovanni, Federico Mazzola, Domenico Di Sante
Abstract Electronic nematicity, the spontaneous breaking of rotational symmetry, has emerged as a key instability in correlated quantum systems. CsTi 3 Bi 5 , a kagome metal of the AV 3 Sb 5 (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 CsTi 3 Bi 5 , providing a microscopic framework for nematic order in kagome systems.