Comment on “Photon energy and carrier density dependence of spin dynamics in bulk CdTe crystal at room temperature” [ Appl. Phys. Lett. 94, 241112 (2009) ]

摘要

In a recent letter,1 Ma et al. measured the density dependencenof electron spin relaxation time in intrinsic bulk CdTenat room temperature. They found that the electron spin lifetimenfirst increases then decreases with increasing excitationndensity. They attributed the increase of spin lifetime at lownexcitation density to the D’yakonov–Perel’ mechanismnwhereas the decrease at high excitation density to the Elliott–nYafet mechanism. They concluded that the Elliott–Yafetnmechanism dominates spin relaxation at high excitation densitynin CdTe at room temperature.