Efficient spin depolarization in ZnCdSe spin detector: an important factor limiting optical spin injection efficiency in ZnMnSe/ZnCdSe spin light-emitting structures
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(0) (0 Votes)Views: (2006) Date: (Publication Date: Nov 2004) Pages: () -
Author: Chen W. M. Buyanova I. A. Kayanuma K. Chen Z. H. Murayama A. Oka Y. Toropov A. A. Sorokin S. V. Ivanov S. V. Kopev P. S. Department of Physics and Measurement Technology Linköping University 58183 Linköping Sweden;
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Abstract: Abstract Spin depolarization of a ZnCdSe quantum-well spin detector (SD) in ZnMnSe/ZnCdSe light-emitting quantum structures is investigated by cw and time-resolved optical orientation spectroscopy. It is shown that spin depolarization is governed by three distinct spin relaxation processes with the corresponding polarization decay times of 850, 30, and «10 ps. The dominant and the fastest process is attributed to spin relaxation accompanying energy relaxation of hot excitons (and hot carriers) within the SD, providing evidence that it can be an important source of spin loss, leading to the observed limited efficiency of optical spin injection in the structures.
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