Pomeranchuk instability from electronic correlations in CsTi₃Bi₅ kagome metal.

ABSTRACT: 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 di

SUBMITTER: Bigi C 

PROVIDER: S-EPMC12789546 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature