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Heating of the Mn spin system by photoexcited holes in type‐II (Zn,Mn)Se/(Be,Mn)Te quantum wells
Author(s) -
Debus J.,
Maksimov A. A.,
Dunker D.,
Yakovlev D. R.,
Filatov E. V.,
Tartakovskii I. I.,
Ivanov V. Yu.,
Waag A.,
Bayer M.
Publication year - 2014
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.201350320
Subject(s) - spins , excitation , spin (aerodynamics) , quantum well , photoluminescence , heterojunction , relaxation (psychology) , ion , condensed matter physics , materials science , semiconductor , atomic physics , laser , chemistry , optoelectronics , physics , optics , psychology , social psychology , organic chemistry , quantum mechanics , thermodynamics
The efficiency of the Mn‐spin system heating under pulsed laser excitation is studied in diluted magnetic semiconductor heterostructures Zn 0.99 Mn 0.01 Se/Be 0.93 Mn 0.07 Te with type‐II band alignment by means of time‐resolved photoluminescence and pump‐probe reflectivity. An essential role in the heating is played by multiple spin‐flip scatterings of a hole with localized spins of Mn 2+ ions. The efficiency of the spin and energy transfer from photoexcited holes to Mn ions of the Zn 0.99 Mn 0.01 Se layer considerably depends on the hole lifetime in this layer. This lifetime can be limited by the hole relaxation into the Be 0.93 Mn 0.07 Te layers and is strongly sensitive to the excitation power and Zn 0.99 Mn 0.01 Se layer thickness. These dependences allow us to determine a characteristic time of about 20ps for the spin and energy transfer from photoexcited holes to the Mn spin system.