Measurement of exciton lifetime in double semimagnetic quantum well by means of magneto-optical Kerr effect
Deysadze G. R. 1, Afanasiev M. M.1, Gribakin B. F.2, Karczewski G.3, Kavokin K. V.2, Kusrayev Yu. G.1, Kalevich V. K.
1
1Ioffe Institute, St. Petersburg, Russia
2St. Petersburg State University, St. Petersburg, Russia
3Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
Email: m.afanasiev@mail.ioffe.ru, kalevich@solid.ioffe.ru
Magneto-optical Kerr effect caused by weak oscillating magnetic field in Faraday geometry was used for measuring of the exciton radiative Γ 0 and nonradiative Γ damping rates in semimagnetic quantum well Cd0.984Mn0.016Te, separated from more wide nonmagnetic quantum well CdTe by tunnel-transparent barrier. Measured values in energetic units were found to be hΓ 0~114 μeV and hΓ~4.6 meV. Large value of Γ means that the time of carriers tunneling from narrow well to wide one is shorter than 0.1 ps. Keywords: semimagnetic semiconductor nanostructures, magneto-optical Kerr effect.
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