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<p>Recently, the unconventional charge density wave (CDW) order with loop currents has attracted considerable attention in the Kagome material family AV<sub>3</sub>Sb<sub>5</sub> (A = K, Rb, Cs). However, experimental signatures of loop current order remain elusive. In this work, based on the mean-field free energy, we analyze the collective modes of unconventional CDW order in a Kagome lattice model. Furthermore, we point out that phase modes in the imaginary CDW (iCDW) order with loop current orders result in time-dependent stray fields. We thus propose using nitrogen-vacancy (NV) centers to detect these time-dependent stray fields, providing a potential experimental approach to identifying loop current order.</p>

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Probing loop currents and collective modes of charge density waves in Kagome materials with NV centers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月20日

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  • Ying-Ming Xie,
  • Naoto Nagaosa

摘要

Recently, the unconventional charge density wave (CDW) order with loop currents has attracted considerable attention in the Kagome material family AV3Sb5 (A = K, Rb, Cs). However, experimental signatures of loop current order remain elusive. In this work, based on the mean-field free energy, we analyze the collective modes of unconventional CDW order in a Kagome lattice model. Furthermore, we point out that phase modes in the imaginary CDW (iCDW) order with loop current orders result in time-dependent stray fields. We thus propose using nitrogen-vacancy (NV) centers to detect these time-dependent stray fields, providing a potential experimental approach to identifying loop current order.