Fig. 1. Low-temperature spectra of GaAs nanowires treated by Ar plasma at different bias powers

Fig. 2. Spectrograms of sample 1. (a) Variable power spectra; (b) variable power fitting diagrams of peaks E1 and E2; (c) variable temperature fitting diagrams of peaks E1 and E2

Fig. 3. Spectrograms of sample4. (a) Variable power spectra; (b) variable power fitting diagram of peak E3; (c) variable power fitting diagram of peak E4

Fig. 4. Variable temperature spectra of sample 4

Fig. 5. Comparison diagrams of photoluminescence peaks and intensity. (a) Changes of photoluminescence peaks; (b) changes of photoluminescence intensity