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<p>The topology and correlation are two significant ingredients in condensed matter physics, and it has become a research focus to intertwine them together for exploring the exotic quantum phenomena. Although charge density wave (CDW) phases have been observed in numerous solid state materials, the topological CDW is still seldom reported. In this work, based on first-principles calculations, we found that the recently discovered CDW phase in CsV<sub>3</sub>Sb<sub>5</sub> is also topological nontrivial. Combining the smoking-gun signatures of nonzero topological index and in-gap topological hinge states, the second-order nontrivial topology is identified in two CDW gaps around the Fermi level. Physically, the hinge states are stacked from the corner states created by breaking the strong bonds in the CDW superlattice, illustrating a two-dimensional origin of the topological boundary states. Our results demonstrate a unique topological CDW in the Kagome metal CsV<sub>3</sub>Sb<sub>5</sub>, providing a chance to investigate the interplay between topology, correlation, and superconductivity.</p>

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Topological charge density wave in kagome metal CsV3Sb5

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Tiancheng Fang,
  • Tianyi Hu,
  • Tingfeng Zhang,
  • Zhengfei Wang

摘要

The topology and correlation are two significant ingredients in condensed matter physics, and it has become a research focus to intertwine them together for exploring the exotic quantum phenomena. Although charge density wave (CDW) phases have been observed in numerous solid state materials, the topological CDW is still seldom reported. In this work, based on first-principles calculations, we found that the recently discovered CDW phase in CsV3Sb5 is also topological nontrivial. Combining the smoking-gun signatures of nonzero topological index and in-gap topological hinge states, the second-order nontrivial topology is identified in two CDW gaps around the Fermi level. Physically, the hinge states are stacked from the corner states created by breaking the strong bonds in the CDW superlattice, illustrating a two-dimensional origin of the topological boundary states. Our results demonstrate a unique topological CDW in the Kagome metal CsV3Sb5, providing a chance to investigate the interplay between topology, correlation, and superconductivity.