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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