Unconventional strong 3p–3d orbital hybridization in sulfur-doped FeSe: for tailored ultrathin electromagnetic wave absorbers

reaches 5.52 GHz at a thickness of only 1.3 mm, an increase of 132.5%. The minimum reflection loss (RL) is -59.6 dB, an improvement of 196.5%. This work provides a theoretical foundation for constructing polarization centers.