Fig. 4
a–d Isosurface of charge accumulation and depletion of monolayer-blueP/g-GaN heterostructure under Eext of 0.3 eV/Å, 0.5 eV/Å, − 0.3 eV/Å, and − 0.7 eV/Å, respectively. Orange and light green isosurfaces represent positive charge accumulation and charge depletion, respectively. e Planar-averaged electron density Δρ(z) at different electrical field for monolayer-blue-P/g-GaN