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<p>The kagome metals <i>A</i>V<sub>3</sub>Sb<sub>5</sub> (<i>A</i>&#xa0;=&#xa0;Cs, Rb, K) host multiple symmetry-breaking phases, including charge-density-wave and loop-current orders, and exhibit highly exotic superconductivity with pronounced nematicity and chirality. Remarkably, even dilute impurities transform this exotic superconducting state into an isotropic <i>s</i>-wave state. These observations pose a challenge to existing theoretical scenarios. We show that loop-current order induces nematic chiral <i>d</i>-wave superconductivity in kagome metals. The loop-current-induced orbital magnetization (OM) stabilizes one chiral superconducting channels. This OM-chirality coupling mechanism is generic and applies to pairing driven by either attractive or repulsive interactions. Furthermore, coexisting loop-current and bond orders give rise to pronounced nematic chiral superconductivity even for an almost <i>C</i><sub>6</sub>-symmetric Fermi surface. For attractive pairing, dilute impurities suppress the chiral state and restore a conventional <i>s</i>-wave phase, as observed experimentally. The theory further predicts a robust 2&#xa0;×&#xa0;2 pair-density modulation. This study provides key insights into time-reversal-symmetry-breaking exotic superconductivity in kagome metals.</p>

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Nematic and chiral superconductivity emerging within the loop-current phase in kagome metals

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月27日

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  • Rina Tazai,
  • Youichi Yamakawa,
  • Hiroshi Kontani

摘要

The kagome metals AV3Sb5 (A = Cs, Rb, K) host multiple symmetry-breaking phases, including charge-density-wave and loop-current orders, and exhibit highly exotic superconductivity with pronounced nematicity and chirality. Remarkably, even dilute impurities transform this exotic superconducting state into an isotropic s-wave state. These observations pose a challenge to existing theoretical scenarios. We show that loop-current order induces nematic chiral d-wave superconductivity in kagome metals. The loop-current-induced orbital magnetization (OM) stabilizes one chiral superconducting channels. This OM-chirality coupling mechanism is generic and applies to pairing driven by either attractive or repulsive interactions. Furthermore, coexisting loop-current and bond orders give rise to pronounced nematic chiral superconductivity even for an almost C6-symmetric Fermi surface. For attractive pairing, dilute impurities suppress the chiral state and restore a conventional s-wave phase, as observed experimentally. The theory further predicts a robust 2 × 2 pair-density modulation. This study provides key insights into time-reversal-symmetry-breaking exotic superconductivity in kagome metals.