A non-Hermitian optical atomic mirror
| Autor: | Jhih-Shih You, Hsiang-Hua Jen, Yi-Cheng Wang |
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| Rok vydání: | 2022 |
| Předmět: |
Quantum Physics
Multidisciplinary Quantum Gases (cond-mat.quant-gas) Atomic Physics (physics.atom-ph) FOS: Physical sciences General Physics and Astronomy General Chemistry Quantum Physics (quant-ph) Condensed Matter - Quantum Gases General Biochemistry Genetics and Molecular Biology Optics (physics.optics) Physics - Atomic Physics Physics - Optics |
| Zdroj: | Nature communications. 13(1) |
| ISSN: | 2041-1723 |
| Popis: | 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. 8 + 20 pages, 4 + 7 figures |
| Databáze: | OpenAIRE |
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