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A non-Hermitian optical atomic mirror

Author

Listed:
  • Yi-Cheng Wang

    (National Taiwan University
    Institute of Atomic and Molecular Sciences, Academia Sinica)

  • Jhih-Shih You

    (National Taiwan Normal University)

  • H. H. Jen

    (Institute of Atomic and Molecular Sciences, Academia Sinica)

Abstract

Explorations of symmetry and topology have led to important breakthroughs in quantum optics, but much richer behaviors arise from the non-Hermitian nature of light-matter interactions. A high-reflectivity, non-Hermitian optical mirror can be realized by a two-dimensional subwavelength array of neutral atoms near the cooperative resonance associated with the collective dipole modes. Here we show that exceptional points develop from a nondefective degeneracy by lowering the crystal symmetry of a square atomic lattice, and dispersive bulk Fermi arcs that originate from exceptional points are truncated by the light cone. From its nontrivial energy spectra topology, we demonstrate that the geometry-dependent non-Hermitian skin effect emerges in a ribbon geometry. Furthermore, skin modes localized at a boundary show a scale-free behavior that stems from the long-range interaction and whose mechanism goes beyond the framework of non-Bloch band theory. Our work opens the door to the study of the interplay among non-Hermiticity, topology, and long-range interaction.

Suggested Citation

  • Yi-Cheng Wang & Jhih-Shih You & H. H. Jen, 2022. "A non-Hermitian optical atomic mirror," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32372-3
    DOI: 10.1038/s41467-022-32372-3
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    References listed on IDEAS

    as
    1. Jun Rui & David Wei & Antonio Rubio-Abadal & Simon Hollerith & Johannes Zeiher & Dan M. Stamper-Kurn & Christian Gross & Immanuel Bloch, 2020. "A subradiant optical mirror formed by a single structured atomic layer," Nature, Nature, vol. 583(7816), pages 369-374, July.
    2. Bo Zhen & Chia Wei Hsu & Yuichi Igarashi & Ling Lu & Ido Kaminer & Adi Pick & Song-Liang Chua & John D. Joannopoulos & Marin Soljačić, 2015. "Spawning rings of exceptional points out of Dirac cones," Nature, Nature, vol. 525(7569), pages 354-358, September.
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    Cited by:

    1. Qiuyan Zhou & Jien Wu & Zhenhang Pu & Jiuyang Lu & Xueqin Huang & Weiyin Deng & Manzhu Ke & Zhengyou Liu, 2023. "Observation of geometry-dependent skin effect in non-Hermitian phononic crystals with exceptional points," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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