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Exciton Spin Injection in CdTe/Cd 1–x Mn x Te Double Quantum Wells
Author(s) -
Kayanuma K.,
Debnath M.C.,
Souma I.,
Chen Z.,
Murayama A.,
Kobayashi M.,
Miyazaki H.,
Oka Y.
Publication year - 2002
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 - 10.1002/1521-3951(200201)229:2<761::aid-pssb761>3.0.co;2-f
Subject(s) - exciton , condensed matter physics , quantum well , cadmium telluride photovoltaics , photoluminescence , biexciton , spin (aerodynamics) , relaxation (psychology) , excitation , spin polarization , magnetic field , materials science , physics , electron , optoelectronics , optics , quantum mechanics , laser , thermodynamics , psychology , social psychology
Spin injection processes of excitons were studied by time‐resolved photoluminescence in double quantum wells consisting of Cd 0.95 Mn 0.05 Te and CdTe layers. Selective excitation of the magnetic and non‐magnetic wells confirms the dominant spin injection process from the magnetic well to the non‐magnetic well. The exciton spin injection from the magnetic quantum well of Cd 0.95 Mn 0.05 Te arises with an injection time of 10 ps and induces a transient spin polarization with the degree of 0.20 in the non‐magnetic well of CdTe. The exciton spin relaxation time in the CdTe well was found to be sufficiently longer than the exciton lifetime of 38 ps.