A non-Hermitian optical atomic mirror

Yi-Cheng Wang (), Jhih-Shih You () and H. H. Jen ()
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Yi-Cheng Wang: National Taiwan University
Jhih-Shih You: National Taiwan Normal University
H. H. Jen: Institute of Atomic and Molecular Sciences, Academia Sinica

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-32372-3

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