Fig. 1. One-dimensional periodic potentials and energy-band structures of undoped and acceptor-doped semiconductors. (a) One-dimensional periodic potentials; (b) energy-band structures

Fig. 2. High-order harmonic generation (HHG) spectra with different doping rates. Dotted lines show HHG spectra with doping rate of 0 (undoped) and solid lines show HHG spectra with different doping rates. (a) Doping rate is 0.016; (b) doping rate is 0.048; (c) doping rate is 0.111; (d) doping rate is 0.143

Fig. 3. TDPI images with different doping rates. (a) Doping rate is 0 (undoped); (b) doping rate is 0.143