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Spin-injection dynamics in a magnetic double quantum well studied by pump-probe absorption spectroscopy

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4 Author(s)
Nishibayashi, K. ; Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan ; Souma, I. ; Murayama, A. ; Oka, Y.

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We study spin-injection dynamics in a magnetic double quantum well by pump-probe absorption spectroscopy. Time dependences of the absorption saturation intensity show a tunneling of spin-polarized carriers from a diluted magnetic well (MW) of Cd0.92Mn0.08Te into a nonmagnetic well (NMW) of CdTe, where the individual tunneling of the electron and heavy hole is elucidated with time constants of 150 ps and 1 ns. The circular polarization degree of the absorption saturation in NMW increases from 0 to 70 ps, which is caused by the injection of electron spin polarized in MW with a time constant of 54 ps.

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Applied Physics Letters  (Volume:88 ,  Issue: 21 )