Fig. 1. Two coherent beams illuminate on the Dirac semimetal film, I₊ and I₋ represent the coherent input beams, O₊ and O₋ correspond to the output lights, the incident angle of the coherent input light is θ, and the thickness of the BDS film is d.

Fig. 2. (a) Spectra of transmission, reflection, and absorption for Dirac semimetal film illuminated normally by a single TM-polarized beam. (b) The corresponding phase difference of reflection and transmission coefficients.

Fig. 3. (a) Coherent absorption as a function of frequency and phase difference of the two input beams, and the maximal coherent absorption appears at the frequency of 43.89 THz with zero phase difference. (b) The coherent absorption with the change of phase difference at the frequency of 43.89 THz.

Fig. 4. (a) Frequency dispersion for TM-polarized and TE-polarized waves illuminating obliquely on the absorber and (b) the relevant maximal coherent absorption.

Fig. 5. Regulation of coherent absorption via changing the thickness of BDS thin film for the parameters E_F = 0.15 eV, g = 40, Δϕ₂ = 0, and θ = 0.

Fig. 6. Manipulation of coherent absorption by changing the Fermi energy E_F, for the parameters g = 40, d = 3.1 µm, Δϕ₂ = 0, and θ = 0.

Fig. 7. Coherent absorption spectrum as a function of frequency for different degeneracy factors g, in which g = 40, ε_b = 1 corresponds to AlCuFe quasi-crystals, g = 24, ε_b = 6.2 corresponds to Eu₂IrO₇, and g = 4, ε_b = 12 corresponds to Na₃Bi.