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<p>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 (<i>d</i>-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.</p>

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Pomeranchuk instability from electronic correlations in CsTi3Bi5 kagome metal

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月23日

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  • 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

摘要

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.