Premium
High‐density selective excitation effect on excitons in semimagnetic semiconductor CdMnTe
Author(s) -
Katayama K.,
Miyajima K.,
Ashida M.,
Itoh T.
Publication year - 2006
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.200672133
Subject(s) - exciton , excitation , exchange interaction , condensed matter physics , spins , polaron , luminescence , chemistry , picosecond , semiconductor , electron , magnetic field , atomic physics , electron hole , physics , laser , optoelectronics , ferromagnetism , optics , quantum mechanics
Many body effects among electron–hole pairs and exchange interaction of spins between electron/hole and Mn 2+ ions have been investigated in a semimagnetic semiconductor of CdMnTe under the selective excitation of high‐density localized excitons with use of a picosecond pulse laser. A new nonlinear luminescence band (X band) has been found on the high‐energy side of conventional exciton magnetic polaron band and its peak energy shows a pronounced red shift with the increase of excitation power and/or with the application of magnetic field. Time‐resolved luminescence without magnetic field has revealed the characteristic behaviour of the X band with a longer rise time for the higher energy side. However, this tendency disappears with the application of magnetic field. As the origin of the X band, we propose the high‐density spin‐polarized electron–hole pairs interacting with microscopic Mn 2+ ‐ion spins aligned through the exchange interaction. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)