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<p>Previous theoretical efforts have predicted a type of unconventional antiferromagnet characterized by a crystal symmetry that connects antiferromagnetic sublattices in real space and simultaneously couples spin and momentum in reciprocal space. This results in a unique crystal-symmetry-paired spin–valley locking and related properties including piezomagnetism and non-collinear spin current even without spin–orbit coupling. However, most known unconventional antiferromagnets do not meet the necessary symmetry requirements for non-relativistic spin current, and this limits applications in spintronic devices. Here we demonstrate crystal-symmetry-paired spin–valley locking in a layered room-temperature antiferromagnetic compound, Rb<sub>1−<i>δ</i></sub>V<sub>2</sub>Te<sub>2</sub>O. Spin-resolved photoemission measurements directly show the opposite spin splitting between crystal-symmetry-paired valleys. Quasi-particle interference patterns show the suppression of intervalley scattering due to the spin selection rules that are a direct consequence of the spin–valley locking. These results suggest that Rb<sub>1−<i>δ</i></sub>V<sub>2</sub>Te<sub>2</sub>O is a potential room-temperature altermagnet candidate. Our observations highlight a methodology that enables both the advantages of layered materials and possible control through crystal symmetry manipulation for advancements in magnetism, electronics and information technology.</p>

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Crystal-symmetry-paired spin–valley locking in a layered room-temperature metallic altermagnet candidate

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Fayuan Zhang,
  • Xingkai Cheng,
  • Zhouyi Yin,
  • Changchao Liu,
  • Liwei Deng,
  • Yuxi Qiao,
  • Zheng Shi,
  • Shuxuan Zhang,
  • Junhao Lin,
  • Zhengtai Liu,
  • Mao Ye,
  • Yaobo Huang,
  • Xiangyu Meng,
  • Cheng Zhang,
  • Taichi Okuda,
  • Kenya Shimada,
  • Shengtao Cui,
  • Yue Zhao,
  • Guang-Han Cao,
  • Shan Qiao,
  • Junwei Liu,
  • Chaoyu Chen

摘要

Previous theoretical efforts have predicted a type of unconventional antiferromagnet characterized by a crystal symmetry that connects antiferromagnetic sublattices in real space and simultaneously couples spin and momentum in reciprocal space. This results in a unique crystal-symmetry-paired spin–valley locking and related properties including piezomagnetism and non-collinear spin current even without spin–orbit coupling. However, most known unconventional antiferromagnets do not meet the necessary symmetry requirements for non-relativistic spin current, and this limits applications in spintronic devices. Here we demonstrate crystal-symmetry-paired spin–valley locking in a layered room-temperature antiferromagnetic compound, Rb1−δV2Te2O. Spin-resolved photoemission measurements directly show the opposite spin splitting between crystal-symmetry-paired valleys. Quasi-particle interference patterns show the suppression of intervalley scattering due to the spin selection rules that are a direct consequence of the spin–valley locking. These results suggest that Rb1−δV2Te2O is a potential room-temperature altermagnet candidate. Our observations highlight a methodology that enables both the advantages of layered materials and possible control through crystal symmetry manipulation for advancements in magnetism, electronics and information technology.