Pomeranchuk instability from electronic correlations in CsTi3Bi5 kagome metal
Electronic nematicity, the spontaneous breaking of rotational symmetry, has emerged as a key instability in correlated quantum systems. CsTi<sub>3</sub>Bi<sub>5</sub>, a kagome metal of the AV<sub>3</sub>Sb<sub>5</sub> (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<sub>3</sub>Bi<sub>5</sub>, providing a microscopic framework for nematic order in kagome systems.
Authors
- Lennart Klebl (ORCID: https://orcid.org/0000-0002-5453-9779)
- Chiara Bigi (ORCID: https://orcid.org/0000-0003-0977-3993)
- Matteo Dürrnagel (ORCID: https://orcid.org/0000-0001-5799-4008)
- Ganesh Pokharel (ORCID: https://orcid.org/0000-0002-1383-3437)
- S. D. Wilson
- Marta Zonno (ORCID: https://orcid.org/0000-0003-0668-5146)
- T. Jaouen (ORCID: https://orcid.org/0000-0001-5844-5385)
- Armando Consiglio (ORCID: https://orcid.org/0000-0001-5537-485X)
- Alessandro De Vita (ORCID: https://orcid.org/0000-0001-9413-2810)
- Ilija Zeljkovic (ORCID: https://orcid.org/0000-0001-9966-2140)
- Federico Mazzola (ORCID: https://orcid.org/0000-0002-5380-4374)
- Justin W. Wells (ORCID: https://orcid.org/0000-0001-6366-366X)
- Riccardo Comin (ORCID: https://orcid.org/0000-0002-1069-9973)
- Dongjin Oh (ORCID: https://orcid.org/0000-0003-3681-0147)
- Brenden R. Ortiz (ORCID: https://orcid.org/0000-0002-1333-7003)
- Jill A. Miwa (ORCID: https://orcid.org/0000-0001-8392-2630)
- Patrick Le Fèvre (ORCID: https://orcid.org/0000-0001-9800-8059)
- Pascal Turban (ORCID: https://orcid.org/0000-0002-9636-767X)
- Hulerich Camel Tchouekem
- Ronny Thomale
- Domenico Di Sante
- Giorgio Sangiovanni
- François Bertran
Institutions
- Boston College (US)
- Oak Ridge National Laboratory (US)
- University of California, Santa Barbara (US)
- Universität Hamburg (DE)
- University of Oslo (NO)
- Aarhus University (DK)
- University of Würzburg (DE)
- Istituto Nazionale di Fisica Nucleare, Galileo Galilei Institute for Theoretical Physics (IT)
- Synchrotron soleil (FR)
- Osservatorio astronomico di Bologna (IT)
- Istituto Officina dei Materiali (IT)
- Institut de Physique de Rennes (FR)
- Instituto de Física Teórica (ES)
- Hamburg Institut (Germany) (DE)
- Technische Universität Berlin (DE)
- Université de Rennes (FR)
- University of West Georgia (US)
- Massachusetts Institute of Technology (US)
- University of Bologna (IT)
Publication Details
- Journal
- Nature Communications
- Published
- 2025-12-23
- DOI
- https://doi.org/10.1038/s41467-025-67037-4
- Citations
- 3
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 3.74
Funders
- National Science Foundation
- U.S. Department of Energy
- European Commission
- Friedrich-Alexander-Universität Erlangen-Nürnberg
- Deutsche Forschungsgemeinschaft
- Studienstiftung des Deutschen Volkes
- DanScatt
- Gauss Centre for Supercomputing
- Office of Science
- University of California, Santa Barbara
- Leibniz-Gemeinschaft
- Division of Materials Research
- Basic Energy Sciences