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Magneto-Photoluminescence and Spin Dynamics of Self-Assembled CdSe Quantum Dots in Zn1-xMnxSe
EunsoonOh,S.M.Soh,이중욱,K.J.Yee,J.C.Woo,H.S.Jeon,김대식,S.Lee,J.K.Furdyna,H.C.Ri,H.S.Chany,S.H.Park 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.6
We have studied photoluminescence spectra of CdSe self-assembled quantum dots (QD's) embedded in Zn$_{1-x}$Mn$_x$Se ($x$ = 0.05 and 0.15) with and without an external magnetic field. Under a magnetic field, the photoluminescence from CdSe QD's was circularly polarized under light excitation above the bandgap energy of ZnMnSe, indicating carrier spin polarization in CdSe QD's. The time-resolved photoluminescence study showed that spin-flip occured very rapidly as photocarriers transfered from the ZnMnSe to the CdSe QD's to reach statistical equilibrium of the spin states in the CdSe QD's. The Zeeman splitting in the CdSe QD's was several meV, still larger than the thermal energy at 5 K. These results suggest that the spin-polarization in CdSe QD's is mainly due to the Zeeman splitting of carriers in the CdSe quantum dots.
( Eun Soon Oh ) 한국실천유아교육학회 (구 한국Montessori교육학회) 2010 실천유아교육 Vol.15 No.-
New knowledge and skills acquired through the synergy of individuality and diversity will lead the society and culture in the 21st century. Contrasted with the isolation and exclusiveness in the 20thcentury, the synergy of individuality and diversity will be made through the mutual understanding and respect among people. In early childhood, children are beginning learners in their society, immature in body and mentality. They require social learning skills that will embrace the diversities within their culture. Korea is divided into South and North for over 60 years. As South Korea embraces the advanced society, understanding the South and North and the national education for the advanced society should be included in the early childhood education curriculum. The great scholars supported the premise that early childhood is the fundamental period for forming the personality and learning the basic knowledge and skills for the present and future. The encouragement of this global trend for individuality and diversity in current Korean early childhood program is in the beginning stages. Mixed racial families are becoming more prevalent in the Korean society. In the education area, the teaching method is just as important as the content. The type of teaching method, whether it is an experience or instructional-based method, depends on the learner and the knowledge trait. The teaching method has to focus on the learner and the characteristic of knowledge.