Pomeranchuk instability from electronic correlations in CsTi3Bi5 kagome metal

Chiara Bigi; Matteo Dürrnagel; Lennart Klebl; Armando Consiglio; Ganesh Pokharel; Marta Zonno; François Bertran; Patrick Le Fèvre; Thomas Jaouen; Hulerich C. Tchouekem; Pascal Turban; Alessandro De Vita; Jill A. Miwa; Justin W. Wells; Dongjin Oh; Riccardo Comin; Ronny Thomale; Ilija Zeljkovic; Brenden R. Ortiz; Stephen D. Wilson; Giorgio Sangiovanni; Federico Mazzola; Domenico Di Sante

doi:10.1038/s41467-025-67037-4

Pomeranchuk instability from electronic correlations in CsTi₃Bi₅ kagome metal

Chiara Bigi
, Matteo Dürrnagel
, Lennart Klebl
, Armando Consiglio
, Ganesh Pokharel
, Marta Zonno
, François Bertran
, Patrick Le Fèvre
, Thomas Jaouen
, Hulerich C. Tchouekem
, Pascal Turban
, Alessandro De Vita
, Jill A. Miwa
, Justin W. Wells
, Dongjin Oh
, Riccardo Comin
, Ronny Thomale
, Ilija Zeljkovic
, Brenden R. Ortiz
, Stephen D. Wilson

Giorgio Sangiovanni, Federico Mazzola, Domenico Di Sante

Correlated Electron Materials

Research output: Contribution to journal › Article › peer-review

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 direct link between orbital selectivity and symmetry-breaking instabilities in CsTi₃Bi₅, providing a microscopic framework for nematic order in kagome systems.

Original language	English
Article number	325
Journal	Nature Communications
Volume	17
Issue number	1
DOIs	https://doi.org/10.1038/s41467-025-67037-4
State	Published - Dec 2026

Funding

We acknowledge SOLEIL for provision of synchrotron radiation facilities under proposal No. 20231813. M.D., R.T. and G.S. are supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through Project-ID 258499086 - SFB 1170 and through the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter - ct.qmat Project-ID 390858490 - EXC 2147. F.M. is grateful for the project funded by the European Union - NextGenerationEU, M4C2, within the PNRR project NFFA-DI, CUP B53C22004310006, IR0000015. M.D. is grateful for support from a Ph.D. scholarship of the Studienstiftung des deutschen Volkes. A.C. acknowledges support from PNRR MUR project PE0000023-NQSTI. A.C., R.T., G.S. and D.D.S. acknowledge the Gauss Center for Supercomputing e.V. ( https://www.gauss-centre.eu ) for funding this project by providing computing time on the GCS Supercomputer SuperMUC-NG at Leibniz Supercomputing Center ( https://www.lrz.de ). M.D., L.K. and R.T. are grateful for HPC resources provided by the Erlangen National High Performance Computing Center (NHR@FAU) of the Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), that were used for the FRG calculations. NHR funding is provided by federal and Bavarian state authorities. NHR@FAU hardware is partially funded by the DFG - 440719683. I.Z. gratefully acknowledges the support from the National Science Foundation (NSF), Division of Materials Research 2216080. S.D.W. and G.P. gratefully acknowledge support via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i program under award DMR-1906325. Work by B.R.O. was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Sciences and Engineering Division. D.O. and R.C. acknowledge support by the Air Force Office of Scientific Research under grant FA9550-22-1-0432. J.A.M acknowledges funding from DanScatt (7129-00018B). We thank C.A. Baum and H. Hohmann for valuable feedback on the FRG calculations. We thank V. Brouet for valuable discussions.

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Bigi, C., Dürrnagel, M., Klebl, L., Consiglio, A., Pokharel, G., Zonno, M., Bertran, F., Le Fèvre, P., Jaouen, T., Tchouekem, H. C., Turban, P., De Vita, A., Miwa, J. A., Wells, J. W., Oh, D., Comin, R., Thomale, R., Zeljkovic, I., Ortiz, B. R., ... Di Sante, D. (2026). Pomeranchuk instability from electronic correlations in CsTi₃Bi₅ kagome metal. Nature Communications, 17(1), Article 325. https://doi.org/10.1038/s41467-025-67037-4

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title = "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 direct link between orbital selectivity and symmetry-breaking instabilities in CsTi3Bi5, providing a microscopic framework for nematic order in kagome systems.",

author = "Chiara Bigi and Matteo D{\"u}rrnagel and Lennart Klebl and Armando Consiglio and Ganesh Pokharel and Marta Zonno and Fran{\c c}ois Bertran and \{Le F{\`e}vre\}, Patrick and Thomas Jaouen and Tchouekem, \{Hulerich C.\} and Pascal Turban and \{De Vita\}, Alessandro and Miwa, \{Jill A.\} and Wells, \{Justin W.\} and Dongjin Oh and Riccardo Comin and Ronny Thomale and Ilija Zeljkovic and Ortiz, \{Brenden R.\} and Wilson, \{Stephen D.\} and Giorgio Sangiovanni and Federico Mazzola and \{Di Sante\}, Domenico",

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Bigi, C, Dürrnagel, M, Klebl, L, Consiglio, A, Pokharel, G, Zonno, M, Bertran, F, Le Fèvre, P, Jaouen, T, Tchouekem, HC, Turban, P, De Vita, A, Miwa, JA, Wells, JW, Oh, D, Comin, R, Thomale, R, Zeljkovic, I, Ortiz, BR, Wilson, SD, Sangiovanni, G, Mazzola, F & Di Sante, D 2026, 'Pomeranchuk instability from electronic correlations in CsTi₃Bi₅ kagome metal', Nature Communications, vol. 17, no. 1, 325. https://doi.org/10.1038/s41467-025-67037-4

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T1 - Pomeranchuk instability from electronic correlations in CsTi3Bi5 kagome metal

AU - Bigi, Chiara

AU - Dürrnagel, Matteo

AU - Klebl, Lennart

AU - Consiglio, Armando

AU - Pokharel, Ganesh

AU - Zonno, Marta

AU - Bertran, François

AU - Le Fèvre, Patrick

AU - Jaouen, Thomas

AU - Tchouekem, Hulerich C.

AU - Turban, Pascal

AU - De Vita, Alessandro

AU - Miwa, Jill A.

AU - Wells, Justin W.

AU - Oh, Dongjin

AU - Comin, Riccardo

AU - Thomale, Ronny

AU - Zeljkovic, Ilija

AU - Ortiz, Brenden R.

AU - Wilson, Stephen D.

AU - Sangiovanni, Giorgio

AU - Mazzola, Federico

AU - Di Sante, Domenico

PY - 2026/12

Y1 - 2026/12

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/105027083158

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AN - SCOPUS:105027083158

SN - 2041-1723

VL - 17

JO - Nature Communications

JF - Nature Communications

IS - 1

M1 - 325

ER -

Pomeranchuk instability from electronic correlations in CsTi₃Bi₅ kagome metal

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