Fig. 1. Schematic diagrams of atomic structure and the first Brillouin zone of bilayer boron phosphide. (a) B-B configuration; (b) B-P configuration; (c) the first Brillouin zone

Fig. 2. Energy band structures of bilayer boron phosphide with B-B and B-P configurations in the absence of external fields. (a) B-B configuration; (b) B-P configuration

Fig. 3. Energy band structures of bilayer boron phosphide with B-B configuration under different external electric field energies. (a) U=0.25 eV; (b) U=0.50 eV; (c) U=1.00 eV; (d) U=1.50 eV

Fig. 4. Energy band structures of bilayer boron phosphide with B-P configuration under different external electric field energies. (a) U=0.25 eV; (b) U=0.50 eV; (c) U=1.00 eV; (d) U=1.50 eV

Fig. 5. Energy band structures of bilayer boron phosphide with B-B configuration under different external magnetic field energies. (a) ∏(B0)=0.1 eV; (b) ∏(B0)=0.3 eV; (c) ∏(B0)=0.5 eV; (d) ∏(B0)=0.8 eV

Fig. 6. Energy band structures of bilayer boron phosphide with B-P configuration under different external magnetic field energies. (a) ∏(B0)=0.1 eV; (b) ∏(B0)=0.3 eV; (c) ∏(B0)=0.5 eV; (d) ∏(B0)=0.8 eV

Fig. 7. Optical conductivity spectra for two bilayer boron phosphide configurations associated with interband transition under different electric field energies. (a) B-B configuration; (b) B-P configuration

Fig. 8. Optical conductivity spectra for two bilayer boron phosphide configurations associated with interband transition under different magnetic field energies. (a) B-B configuration; (b) B-P configuration

Fig. 9. Optical conductivity spectra for two bilayer boron phosphide configurations associated with intraband transition under different magnetic field energies. (a)(b) B-B configuration; (c)(d) B-P configuration