Abstract
A self-assembled quantum dot (QD) system consisting of adjacent CdSe and CdZnMnSe QD layers in a ZnSe matrix was investigated using polarization-selective magnetophotoluminescence (PL). We can unambiguously identify which QD peak originates from which material, because PL from CdZnMnSe (a diluted magnetic semiconductor) exhibits a large Zeeman shift in the presence of a magnetic field. Significant enhancement of the degree of σ- circular polarization emitted by the nonmagnetic CdSe QDs is observed in the double layer system, as compared to that observed in similar CdSe QDs without the influence of neighboring CdZnMnSe QDs. This behavior can be understood in terms of antiferromagnetic interaction between carrier spins localized in pairs of CdSe and CdZnMnSe QDs that are electronically coupled.
| Original language | English |
|---|---|
| Article number | 033114 |
| Pages (from-to) | 1-3 |
| Number of pages | 3 |
| Journal | Applied Physics Letters |
| Volume | 86 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2005 Jan 17 |
Bibliographical note
Funding Information:This research was supported by NSF Grant Nos. DMR02-45227 and DMR02-01519; the DARPA SpinS Program; and by the Korea Science and Engineering Foundation (KOSEF) through the Quantum Functional Semiconductor Research Center (QSRC) at Dongguk University; and by Korea Research Foundation Grant No. KRF-2004-005-C00068.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)