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<p>When several degrees of freedom in quantum materials have similar energy scales, the intertwined electronic orders, which exhibit broken symmetries, are often strongly coupled. Recent studies on kagome superconductors, such as CsV<sub>3</sub>Sb<sub>5</sub>, report rotational and time-reversal symmetry breaking linked to a charge density wave. Here we observe a momentum-selective response of the electronic structure of CsV<sub>3</sub>Sb<sub>5</sub> to an external magnetic field. By performing angle-resolved photoemission spectroscopy in a tunable magnetic field, we demonstrate that the response of the electronic structure is compatible with piezomagnetism along with strong orbital selectivity. Our results show that the origin of the time-reversal symmetry breaking is associated with the vanadium Van Hove singularities at the onset of the charge-density-wave order. We also demonstrate the presence of fluctuations beyond the charge ordering temperature. Our results reveal that magnetic fields can be used as tuning knobs for disentangling intertwined orders in the momentum space for quantum materials.</p>

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Magnetic field-induced momentum-dependent symmetry breaking in a kagome superconductor

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Jianwei Huang,
  • Zheng Ren,
  • Hengxin Tan,
  • Jounghoon Hyun,
  • Yichen Zhang,
  • Thomas A. Hulse,
  • Zhaoyu Liu,
  • Jonathan M. DeStefano,
  • Yaofeng Xie,
  • Ziqin Yue,
  • Junichiro Kono,
  • Pengcheng Dai,
  • Yu He,
  • Aki Pulkkinen,
  • Ján Minár,
  • Jiun-Haw Chu,
  • Ziqiang Wang,
  • Binghai Yan,
  • Rafael M. Fernandes,
  • Ming Yi

摘要

When several degrees of freedom in quantum materials have similar energy scales, the intertwined electronic orders, which exhibit broken symmetries, are often strongly coupled. Recent studies on kagome superconductors, such as CsV3Sb5, report rotational and time-reversal symmetry breaking linked to a charge density wave. Here we observe a momentum-selective response of the electronic structure of CsV3Sb5 to an external magnetic field. By performing angle-resolved photoemission spectroscopy in a tunable magnetic field, we demonstrate that the response of the electronic structure is compatible with piezomagnetism along with strong orbital selectivity. Our results show that the origin of the time-reversal symmetry breaking is associated with the vanadium Van Hove singularities at the onset of the charge-density-wave order. We also demonstrate the presence of fluctuations beyond the charge ordering temperature. Our results reveal that magnetic fields can be used as tuning knobs for disentangling intertwined orders in the momentum space for quantum materials.