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Diffusion of Carriers Induced by Exchange Interaction with Magnetic‐Ion System in (Zn, Mn)Se/(Zn, Be)Se Quantum Wells
Author(s) -
Keller D.,
Yakovlev D.R.,
Gruber Th.,
Waag A.,
Ossau W.,
Molenkamp L.W.,
Pulizzi F.,
Christianen P.C.M.,
Maan J.C.
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<797::aid-pssb797>3.0.co;2-g
Subject(s) - zeeman effect , exchange interaction , photoluminescence , diffusion , magnetic semiconductor , condensed matter physics , quantum well , scattering , ion , energy level splitting , chemistry , spin diffusion , semiconductor , materials science , magnetic field , physics , optoelectronics , laser , optics , ferromagnetism , organic chemistry , quantum mechanics , thermodynamics
We studied the diffusion of carriers in dilute magnetic semiconductors for conditions when an additional force caused by a spatially inhomogeneous exchange potential is active. The spatially inhomogeneous exchange potential arises from a creation of photocarriers in the Zn 0.988 Mn 0.012 Se/Zn 0.94 Be 0.06 Se quantum well. The photocarriers enhance the spin temperature of the Mn ions by a spin‐flip scattering with the magnetic ions, which results in a reduction of the giant Zeeman splitting. The gaussian like intensity profile of the exciting laser beam causes a locally varying exchange potential for the carriers. A strong influence of the gradient in the exchange potential on the diffusion of the carriers was found. The diffusion of the carriers was examined by a spatially resolved photoluminescence technique.