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Optically controlled magnetization of zero‐dimensional magnetic polarons in CdMnTe self‐assembled quantum dots
Author(s) -
Mackowski S.,
Gurung T.,
Nguyen T. A.,
Jackson H. E.,
Smith L. M.,
Kossut J.,
Karczewski G.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200304166
Subject(s) - polaron , quantum dot , condensed matter physics , magnetization , excitation , exciton , photoluminescence , polarization (electrochemistry) , relaxation (psychology) , physics , chemistry , magnetic field , optoelectronics , electron , quantum mechanics , social psychology , psychology
We find strong optically induced magnetization of zero‐dimensional magnetic polarons confined to CdMnTe quantum dots. The spin alignment of magnetic ions at B = 0 T is created through circularly polarized resonant excitation and it is probed by polarization‐resolved photoluminescence. This observation clearly demonstrates that in the CdMnTe quantum dots the exciton spin relaxation time is significantly longer than the formation time of magnetic polaron. Importantly, the spatial confinement characteristic of quantum dots increases the stability of magnetic polarons so that significant polarizaton of the emission is observed for temperatures higher than 120 K. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)