Ultrafast dynamics of photo-induced magneto-optical Kerr effect in CdTe at room temperature

A.V. Kimel (1) , F. Bentivegna (2) , V.N. Gridnev (1) , R.V. Pisarev (1) , Th. Rasing (3)

1 A.F. Ioffe Physical-Technical Institute
2 Department of Environmental Science [Radboud Universiteit Nijmegen, Netherlands]
3 Institute for Molecules and Materials

A time-resolved, all-optical technique based on the photo-induced magneto-optical Kerr effect is applied to the spectral study of the sub-picosecond, room temperature spin dynamics in CdTe between 1.44 and 1.63 eV. Two relaxation processes with respective decay times of up to 200 fs and 2.5 ps are distinguished. While the longer one is attributed to electron-spin relaxation, several processes such as the redistribution of electrons in the conduction band or exciton ionization near the band gap are believed to take place on the timescale of the faster one. A change of the spectral dependence of the Kerr effect from a paramagneticlike to a diamagnetic-like regime during this faster relaxation is observed and discussed.

Domaines: Physique [physics]

A.V. Kimel, F. Bentivegna, V.N. Gridnev, R.V. Pisarev, Th. Rasing. Ultrafast dynamics of photo-induced magneto-optical Kerr effect in CdTe at room temperature. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2000, 62 (16), pp.R10610. ⟨hal-01126791⟩