A non-Hermitian optical atomic mirror

• URL: http://arxiv.org/abs/2110.10070v2
• Date: Fri, 24 Dec 2021 09:38:15 GMT
• Title: A non-Hermitian optical atomic mirror
• Authors: Yi-Cheng Wang, Jhih-Shih You, H. H. Jen
• Abstract summary: A high-reflectivity, non-Hermitian optical mirror can be realized by a two-dimensional subwavelength array of neutral atoms. We show that exceptional points develop from a nondefective degeneracy by lowering the crystal symmetry of a square atomic lattice. We also find, although the dipole-dipole interaction is reciprocal, the geometry-dependent non-Hermitian skin effect emerges.
• Score: 6.023710971800604
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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. We also find, although the dipole-dipole interaction is reciprocal, the geometry-dependent non-Hermitian skin effect emerges. 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.

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