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Charge-loop current order and Z3 nematicity mediated by bond order fluctuations in kagome metals

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  • Rina Tazai

    (Kyoto University)

  • Youichi Yamakawa

    (Nagoya University)

  • Hiroshi Kontani

    (Nagoya University)

Abstract

Recent experiments on geometrically frustrated kagome metal AV3Sb5 (A = K, Rb, Cs) have revealed the emergence of the charge loop current (cLC) order near the bond order (BO) phase. However, the origin of the cLC and its interplay with other phases have been uncovered. Here, we propose a novel mechanism of the cLC state, by focusing on the BO phase common in kagome metals. The BO fluctuations in kagome metals, which emerges due to the Coulomb interaction and the electron-phonon coupling, mediate the odd-parity particle-hole condensation that gives rise to the topological current order. Furthermore, the predicted cLC+BO phase gives rise to the Z3-nematic state in addition to the giant anomalous Hall effect. The present theory predicts the close relationship between the cLC, the BO, and the nematicity, which is significant to understand the cascade of quantum electron states in kagome metals. The present scenario provides a natural understanding.

Suggested Citation

  • Rina Tazai & Youichi Yamakawa & Hiroshi Kontani, 2023. "Charge-loop current order and Z3 nematicity mediated by bond order fluctuations in kagome metals," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42952-6
    DOI: 10.1038/s41467-023-42952-6
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