(color online) Phonon spectra of electron-doped arsenenes at four doping levels: (a) 0.1 e/cell. (b) 0.2 e/cell. (c) 0.3 e/cell. (d) 0.4 e/cell. The amplitude of the EPC constant, i.e., λ q ν is mapped by different colors. Panels (e) and (f) show the top and side views of the A₁ optical phonon mode in real space.