Ontology type: schema:ScholarlyArticle
2016-09
AUTHORSS. V. Zaitsev, I. A. Akimov, L. Langer, Yu. A. Danilov, M. V. Dorokhin, B. N. Zvonkov, D. R. Yakovlev, M. Bayer
ABSTRACTThe coherent spin dynamics of carriers in the heterostructures that contain an InGaAs/GaAs quantum well (QW) and an Mn δ layer, which are separated by a narrow GaAs spacer 2–10 nm thick, is comprehensively studied by the magnetooptical Kerr effect method at a picosecond time resolution. The exchange interaction of photoexcited electrons in QW with the ferromagnetic Mn δ layer manifests itself in magnetic-field and temperature dependences of the Larmor precession frequency of electron spins and is found to be very weak (several microelectron volts). Two nonoscillating components related to holes exist apart from an electron contribution to the Kerr signal of polarization plane rotation. At the initial stage, a fast relaxation process, which corresponds to the spin relaxation of free photoexcited holes, is detected in the structures with a wide spacer. The second component is caused by the further spin dephasing of energyrelaxed holes, which are localized at strong QW potential fluctuations in the structures under study. The decay of all contributions to the Kerr signal in time increases substantially when the spacer thickness decreases, which correlates with the enhancement of nonradiative recombination in QW. More... »
PAGES420-428
http://scigraph.springernature.com/pub.10.1134/s106377611607013x
DOIhttp://dx.doi.org/10.1134/s106377611607013x
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