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Strong coupling between cavity photons and various excitations in condensedmatters boosts the field of light-matter interaction and generates severalexciting sub-fields, such as cavity optomechanics and cavity magnon polariton.Axion quasiparticles, emerging in topological insulators, were predicted tostrongly couple with the light and generate the so-called axion polariton.Here, we demonstrate that there arises a gapless level attraction in cavityaxion polariton of antiferromagnetic topological insulators, which originatesfrom a nonlinear interaction between axion and the odd-order resonance ofcavity. Such a novel level attraction is essentially different fromconventional level attractions with the mechanism of either a linear couplingor a dissipation-mediated interaction, and also different from the levelrepulsion induced by the strong coupling in common polaritons. Our resultsreveal a new mechanism of level attractions, and open up new roads forexploring the axion polariton with cavity technologies. They have potentialapplications for quantum information and dark matter research.

Nonlinear level attraction of cavity axion polariton in antiferromagnetic topological insulator