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<p>Inspired by noncollinear magnetic dipole order, noncollinear electric dipole order is anticipated to open up rich ferroelectric physics and new opportunities for device applications. However, establishing such order in single crystals remains challenging, as electric polarization is typically locked to crystallographic axes. Here we report noncollinear ferrielectricity in the van der Waals crystal WO<sub>2</sub>Br<sub>2</sub>, arising from competition between ferroelectric and antiferroelectric phonon modes. The noncollinear dipole order of WO<sub>2</sub>Br<sub>2</sub> is revealed by decoupling the antipolar and the polar displacement components, both of which are directly visualized by scanning transmission electron microscopy. This noncollinear dipole order enables 90° polarization flip under hydrostatic pressure through two energetically degenerate transition pathways. Moreover, ultrafast electron diffraction measurements show that optical excitation drives two distinct coherent phonon modes associated with the ferroelectric and antiferroelectric orders. This work&#xa0;enriches the physics of noncollinear electric dipole order for emergent ferroelectric device applications.</p>

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Noncollinear ferrielectricity in a van der Waals crystal

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月19日

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  • Jierui Fu,
  • Gang Wang,
  • Yingpeng Qi,
  • Wen He,
  • Yuqiang Fang,
  • Gang Tang,
  • Yanting Peng,
  • Dong Wang,
  • Zhenjie Guan,
  • Xuzhou Sun,
  • Shuming Zhang,
  • Zunyi Deng,
  • Yue Liu,
  • Jiapeng Wang,
  • Songge Li,
  • Tingting Li,
  • Jinjing Zhou,
  • Yuchen Shang,
  • Yankun Yin,
  • Zhaoju Yang,
  • Jinzhong Wang,
  • Yang Ding,
  • Dao Xiang,
  • Liang Zhen,
  • Jiawang Hong,
  • Fuqiang Huang,
  • Junhao Lin,
  • Chengyan Xu,
  • Yang Li

摘要

Inspired by noncollinear magnetic dipole order, noncollinear electric dipole order is anticipated to open up rich ferroelectric physics and new opportunities for device applications. However, establishing such order in single crystals remains challenging, as electric polarization is typically locked to crystallographic axes. Here we report noncollinear ferrielectricity in the van der Waals crystal WO2Br2, arising from competition between ferroelectric and antiferroelectric phonon modes. The noncollinear dipole order of WO2Br2 is revealed by decoupling the antipolar and the polar displacement components, both of which are directly visualized by scanning transmission electron microscopy. This noncollinear dipole order enables 90° polarization flip under hydrostatic pressure through two energetically degenerate transition pathways. Moreover, ultrafast electron diffraction measurements show that optical excitation drives two distinct coherent phonon modes associated with the ferroelectric and antiferroelectric orders. This work enriches the physics of noncollinear electric dipole order for emergent ferroelectric device applications.