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Chiral excitonic order from twofold van Hove singularities in kagome metals

Author

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  • Harley D. Scammell

    (University of New South Wales
    University of New South Wales)

  • Julian Ingham

    (Boston University)

  • Tommy Li

    (Freie Universität Berlin)

  • Oleg P. Sushkov

    (University of New South Wales
    University of New South Wales)

Abstract

Recent experiments on kagome metals AV3Sb5 (A=K,Rb,Cs) identify twofold van Hove singularities (TvHS) with opposite concavity near the Fermi energy, generating two approximately hexagonal Fermi surfaces – one electron-like and the other hole-like. Here we propose that a TvHS generates a novel time-reversal symmetry breaking excitonic order – arising due to bound pairs of electrons and holes located at opposite concavity van Hove singularities. We introduce a minimal model for the TvHS and investigate interaction induced many-body instabilities via the perturbative renormalisation group technique and a free energy analysis. Specialising to parameters appropriate for the kagome metals AV3Sb5, we construct a phase diagram comprising chiral excitons, charge density wave and a region of coexistence. We propose this as an explanation of a diverse range of experimental observations in AV3Sb5. Notably, the chiral excitonic state gives rise to a quantum anomalous Hall conductance, providing an appealing interpretation of the observed anomalous Hall effect in kagome metals. Possible alternative realisations of the TvHS mechanism in bilayer materials are also discussed. We suggest that TvHS open up interesting possibilities for correlated phases, enriching the set of competing ground states to include excitonic order.

Suggested Citation

  • Harley D. Scammell & Julian Ingham & Tommy Li & Oleg P. Sushkov, 2023. "Chiral excitonic order from twofold van Hove singularities 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_s41467-023-35987-2
    DOI: 10.1038/s41467-023-35987-2
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    References listed on IDEAS

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    1. Yong Hu & Xianxin Wu & Brenden R. Ortiz & Sailong Ju & Xinloong Han & Junzhang Ma & Nicholas C. Plumb & Milan Radovic & Ronny Thomale & Stephen D. Wilson & Andreas P. Schnyder & Ming Shi, 2022. "Rich nature of Van Hove singularities in Kagome superconductor CsV3Sb5," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    2. He Zhao & Hong Li & Brenden R. Ortiz & Samuel M. L. Teicher & Takamori Park & Mengxing Ye & Ziqiang Wang & Leon Balents & Stephen D. Wilson & Ilija Zeljkovic, 2021. "Cascade of correlated electron states in the kagome superconductor CsV3Sb5," Nature, Nature, vol. 599(7884), pages 216-221, November.
    3. Hongyi Yu & Gui-Bin Liu & Pu Gong & Xiaodong Xu & Wang Yao, 2014. "Dirac cones and Dirac saddle points of bright excitons in monolayer transition metal dichalcogenides," Nature Communications, Nature, vol. 5(1), pages 1-7, September.
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    Cited by:

    1. 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.
    2. Changwon Park & Young-Woo Son, 2023. "Condensation of preformed charge density waves in kagome metals," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    3. Wenbin Wu & Zeping Shi & Mykhaylo Ozerov & Yuhan Du & Yuxiang Wang & Xiao-Sheng Ni & Xianghao Meng & Xiangyu Jiang & Guangyi Wang & Congming Hao & Xinyi Wang & Pengcheng Zhang & Chunhui Pan & Haifeng , 2024. "The discovery of three-dimensional Van Hove singularity," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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