|
|||||
|
|
Control of spin state in CdSe quantum dots by coupling with magnetic semiconductor quantum dots |
|
| Authors: | Eunsoon Oh D.G. Choi S. Lee D.G. Oh |
| Affiliation: | a Department of Physics, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon, South Korea b Department of Physics, Korea University, Seoul, South Korea c Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA d Material Science Team, Korea Basic Research Institute, Taejeon, South Korea |
| Abstract: | We studied spin states of CdSe quantum dots (QDs) coupled with CdMnSe QDs by probing circular polarization of photoluminescence spectrum under external magnetic fields. The bandgap energies of CdSe and CdMnSe QDs are close to each other and photoluminescence mainly originates from CdSe QDs due to relatively low radiation efficiency of CdMnSe QDs. The photoluminescence lifetime as well as its intensity was decreased with increasing magnetic field, which was ascribed to the increase in the ground state wavefunctions in CdMnSe QDs. The decrease was more pronounced for spin down electrons, which was explained by the difference in spin up and down wave functions under magnetic fields. Our results show that the spin state of CdSe QDs can be manipulated by coupling with CdMnSe QDs. |
| Keywords: | 78.55.Hx 85.60.Jb |
| 本文献已被 ScienceDirect 等数据库收录！ | |