http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Magnetic Polaron Formation Dynamics in Mn^(2+)-Doped Colloidal Nanocrystals up to Room Temperature
Gerd Bacher,Lars Schneider,Rémi Beaulac,Paul I. Archer,Daniel R. Gamelin 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.51
The dynamics of exciton magnetic polaron (EMP) formation after pulsed laser excitation is studied in Mn^(2+)-doped colloidal CdSe nanocrystals. A transient energy shift of more than 130 meV at low temperature is obtained for the characteristic photoluminescence signal, and is related to the alignment of the Mn^(2+)-ion spins in the exchange field of the optically generated electron-hole pairs. The dynamics of laser induced magnetization are characterized by at least two time constants attributed to the EMP formation within a few hundreds of picoseconds, followed by a subsequent reorientation of the EMP spin complex in the nanosecond regime. We found a complete spin alignment up to temperatures of about 50 K and clear signatures of optically induced magnetization up to room temperature.