Abstract
Carrier-spin relaxation under a magnetic field has been studied in a diluted magnetic semiconductor quantum well (DMS-QW) of Cd0.95Mn0.05Te, by means of pump-probe absorption spectroscopy. With resonant excitation using a circularly polarized pump-pulse, dynamical spin-flip processes of an electron and heavy-hole (hh) are clearly observed in time dependences of the circularly polarized differential absorbance. In 0 T, time constants of 17 ps and 0.4 ps for the electron- and hh-spin relaxations in the Cd0.95Mn0.05Te QW are shorter than those of 46 ps and 1.0 ps in a non-magnetic CdTe QW, due to s-d exchange interactions between the carriers and Mn spins. The spin-flip time of the electron due to the exchange mechanism is determined as 27 ps. In an intense magnetic field of 5 T, the electron-spin relaxation due to the exchange mechanism is found to be strongly suppressed in the DMS-QW by magnetic-field-induced pinning of the Mn spins, exhibiting a longer time constant of 29 ps than that of 17 ps in 0 T. The role of LO-phonon is also discussed in the electron-spin relaxation under magnetic fields. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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