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<p>The interplay between strong long-range interactions and the coherent driving contribute to the formation of complex patterns, symmetry, and novel phases of matter in many-body systems. However, long-range interactions may induce an additional dissipation channel, resulting in non-Hermitian many-body dynamics and the emergence of exceptional points in spectrum. Here, we report experimental observation of interaction-induced exceptional points in cold Rydberg atomic gases, revealing the breaking of charge-conjugation parity symmetry. By measuring the transmission spectrum under increasing and decreasing probe intensity, the interaction-induced hysteresis trajectories are observed, which give rise to non-Hermitian dynamics. We record the area enclosed by hysteresis loops and investigate the dynamics of hysteresis loops. The reported exceptional points and hysteresis trajectories in cold Rydberg atomic gases provide valuable insights into the underlying non-Hermitian physics in many-body systems, allowing us to study the interplay between long-range interactions and non-Hermiticity.</p>

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Exceptional point and hysteresis trajectories in cold Rydberg atomic gases

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月13日

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  • Jun Zhang,
  • En-Ze Li,
  • Ya-Jun Wang,
  • Bang Liu,
  • Li-Hua Zhang,
  • Zheng-Yuan Zhang,
  • Shi-Yao Shao,
  • Qing Li,
  • Han-Chao Chen,
  • Yu Ma,
  • Tian-Yu Han,
  • Qi-Feng Wang,
  • Jia-Dou Nan,
  • Yi-Ming Yin,
  • Dong-Yang Zhu,
  • Guang-Can Guo,
  • Dong-Sheng Ding,
  • Bao-Sen Shi

摘要

The interplay between strong long-range interactions and the coherent driving contribute to the formation of complex patterns, symmetry, and novel phases of matter in many-body systems. However, long-range interactions may induce an additional dissipation channel, resulting in non-Hermitian many-body dynamics and the emergence of exceptional points in spectrum. Here, we report experimental observation of interaction-induced exceptional points in cold Rydberg atomic gases, revealing the breaking of charge-conjugation parity symmetry. By measuring the transmission spectrum under increasing and decreasing probe intensity, the interaction-induced hysteresis trajectories are observed, which give rise to non-Hermitian dynamics. We record the area enclosed by hysteresis loops and investigate the dynamics of hysteresis loops. The reported exceptional points and hysteresis trajectories in cold Rydberg atomic gases provide valuable insights into the underlying non-Hermitian physics in many-body systems, allowing us to study the interplay between long-range interactions and non-Hermiticity.