Fig.1

a) Band structure and b) optical selection rules for wurtzite CdS"

Fig.2

Schematic diagram of experimental device for time-resolved Kerr rotation measurements"

Fig.3

TRKR measurements in a CdS single crystal at different wavelengths for T = 5 K and B = 1 T: a) Long-lived spin signal; b) Short-lived spin signal; c) Phase inversion schematic diagram "

Fig.4

Theoretical simulation of Kerr rotation signal: a) Comparison of the spectral dependence of Kerr rotation under the narrowband detection pulse (black dotted line) versus the broadband detection pulse (solid red line); Kerr rotation signal corresponding to each point on the Gaussian spectral line with a center wavelength of b) 489.8 nm, c) 490.7 nm, and d) 488.2 nm"

Fig.5

Wavelength dependence of a) spin-dephasing time $T_2^*$ and b) Larmor precession frequency ${v_{\rm{L}}}$ at $T = 5\;{\rm{ K}}$ "

Fig.6

a), b) TRKR signals at different wavelengths; c) Dependence of the spin dephasing time, $T_2^*$ on wavelength; (d) Dependence of the Larmor precession frequency, ${v_{\rm{L}}}$ on wavelength; Where T = 50 K, B = 1 T "

Fig.7

a) TRKR signals at different wavelengths; b) Dependence of spin dephasing time, $T_2^*$ on wavelength; Where T = 293 K and B = 1 T "

Fig.8

a) Wavelength dependence of spin dephasing time, $T_2^*$ , at different temperatures; b) Temperature dependence of the spin dephasing time, $T_2^*$ , and Larmor precession frequency, ${v_{\rm{L}}}$ , at the emission peak wavelength, inset shows the emission peak as a function of temperature "