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<p>In one-dimensional quantum materials, electrons and lattices can undergo a Peierls transition, a translational symmetry-breaking instability traditionally understood through electron coupling to longitudinal acoustic phonons. Recently, this paradigm has been revised in topological semimetals, where transverse acoustic phonons couple to <i>p</i>-orbital electrons, giving rise to a transverse Peierls transition. Importantly, transverse Peierls transition-induced distortions can further break mirror or inversion symmetries, producing nematic or chiral charge density waves. Here, we report the experimental identification of an incommensurate transverse Peierls transition in EuAl<sub>4</sub>. Using meV-resolution inelastic x-ray scattering, we observe complete softening of a transverse acoustic phonon upon cooling, while the longitudinal acoustic mode remains unaffected. First-principles calculations reveal that the transverse Peierls transition wavevector coincides with a charge susceptibility peak connecting nested Dirac bands. Second harmonic generation confirms mirror symmetry breaking, supporting a chiral charge density wave stabilized by the transverse Peierls transition.</p>

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Incommensurate Transverse Peierls Transition and Signature of Chiral Charge Density Wave in EuAl4

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月24日

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  • F. Z. Yang,
  • K. F. Luo,
  • Weizhe Zhang,
  • Xiaoyu Guo,
  • W. R. Meier,
  • H. Ni,
  • H. X. Li,
  • P. Mercado Lozano,
  • G. Fabbris,
  • A. H. Said,
  • C. Nelson,
  • T. T. Zhang,
  • A. F. May,
  • M. A. McGuire,
  • R. Juneja,
  • L. Lindsay,
  • H. N. Lee,
  • J.-M. Zuo,
  • M. F. Chi,
  • X. Dai,
  • Liuyan Zhao,
  • H. Miao

摘要

In one-dimensional quantum materials, electrons and lattices can undergo a Peierls transition, a translational symmetry-breaking instability traditionally understood through electron coupling to longitudinal acoustic phonons. Recently, this paradigm has been revised in topological semimetals, where transverse acoustic phonons couple to p-orbital electrons, giving rise to a transverse Peierls transition. Importantly, transverse Peierls transition-induced distortions can further break mirror or inversion symmetries, producing nematic or chiral charge density waves. Here, we report the experimental identification of an incommensurate transverse Peierls transition in EuAl4. Using meV-resolution inelastic x-ray scattering, we observe complete softening of a transverse acoustic phonon upon cooling, while the longitudinal acoustic mode remains unaffected. First-principles calculations reveal that the transverse Peierls transition wavevector coincides with a charge susceptibility peak connecting nested Dirac bands. Second harmonic generation confirms mirror symmetry breaking, supporting a chiral charge density wave stabilized by the transverse Peierls transition.