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<p>The discovery of the axial amplitude mode—commonly referred to as the Higgs mode—in charge density wave systems, such as rare-earth tritellurides, indicates the presence of a hidden order. A theoretical study proposed that this axial Higgs mode arises from a hidden orbital texture of the charge density wave, which produces a ferroaxial charge order. However, experimental evidence for the specific hidden order has been lacking. Here, we demonstrate a ferroaxial order of electronic origin throughout the rare-earth tritellurides. In ErTe<sub>3</sub> and HoTe<sub>3</sub>, which exhibit two distinct charge density waves with different ordering temperatures, a detailed investigation shows that the high-temperature charge order phase breaks translational, rotational and all vertical as well as diagonal mirror symmetries. Furthermore, this phase produces an axial Higgs mode and an axial electronic gap. By contrast, the low-temperature phase breaks only translational symmetry and gives rise to a scalar Higgs mode. Notably, both phases preserve the space inversion and time-reversal symmetries. These findings are consistent with a ferroaxial phase driven by coupled orbital and charge orders, highlighting the role of Higgs modes in revealing hidden orders in systems with intertwined charge density waves.</p>

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Ferroaxial density wave from intertwined charge and orbital order in rare-earth tritellurides

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月1日

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  • Birender Singh,
  • Grant McNamara,
  • Kyung-Mo Kim,
  • Saif Siddique,
  • Stephen D. Funni,
  • Weizhe Zhang,
  • Xiangpeng Luo,
  • Piyush Sakrikar,
  • Eric M. Kenney,
  • Ratnadwip Singha,
  • Sergey Alekseev,
  • Sayed Ali Akbar Ghorashi,
  • Thomas J. Hicken,
  • Christopher Baines,
  • Hubertus Luetkens,
  • Yiping Wang,
  • Vincent M. Plisson,
  • Michael Geiwitz,
  • Connor A. Occhialini,
  • Riccardo Comin,
  • Michael J. Graf,
  • Liuyan Zhao,
  • Jennifer Cano,
  • Rafael M. Fernandes,
  • Judy J. Cha,
  • Leslie M. Schoop,
  • Kenneth S. Burch

摘要

The discovery of the axial amplitude mode—commonly referred to as the Higgs mode—in charge density wave systems, such as rare-earth tritellurides, indicates the presence of a hidden order. A theoretical study proposed that this axial Higgs mode arises from a hidden orbital texture of the charge density wave, which produces a ferroaxial charge order. However, experimental evidence for the specific hidden order has been lacking. Here, we demonstrate a ferroaxial order of electronic origin throughout the rare-earth tritellurides. In ErTe3 and HoTe3, which exhibit two distinct charge density waves with different ordering temperatures, a detailed investigation shows that the high-temperature charge order phase breaks translational, rotational and all vertical as well as diagonal mirror symmetries. Furthermore, this phase produces an axial Higgs mode and an axial electronic gap. By contrast, the low-temperature phase breaks only translational symmetry and gives rise to a scalar Higgs mode. Notably, both phases preserve the space inversion and time-reversal symmetries. These findings are consistent with a ferroaxial phase driven by coupled orbital and charge orders, highlighting the role of Higgs modes in revealing hidden orders in systems with intertwined charge density waves.