Physics of the Solid State
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Manifestation of the exchange interaction of electrons separated by a potential barrier in double quantum wells in the Kerr effect
Degoev M. M.1, Afanasiev M. M.1, Kalevich V. K.1, Kavokin K. V.2, Kozyrev N. V.1, Karczewski G.3, Kusrayev Yu. G.1
1Ioffe Institute, St. Petersburg, Russia
2St. Petersburg State University, St. Petersburg, Russia
3Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
Email: kalevich@solid.ioffe.ru

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In tunnel-coupled quantum wells of different widths, it was found that the spin dynamics arising from resonant pulsed optical pumping of an exciton in the narrow well includes the dynamics of electron spin polarization in the wide well, although the electron level in the wide well is 55 meV lower than the electron level in the narrow well. An analysis of the obtained results showed that the observed effect is caused by the exchange interaction of spin-polarized electrons in the wide well with exciton states in the narrow well. Keywords: semiconductor nanostructures, exchange interaction, Kerr effect.
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