Dopant-carrier magnetic exchange coupling in colloidal inverted core/shell semiconductor nanocrystals.
Dopant-carrier magnetic exchange interactions in semiconductor nanostructures give rise to unusually large Zeeman splittings of the semiconductor band levels, raising possibilities for spin-based electronics or photonics applications. Here we evaluate the recently highlighted possibility of confinement-induced kinetic s-d exchange coupling in doped ZnSe/CdSe inverted core/shell nanocrystals. Magneto-optical studies of a broad series of Co(2+)- and Mn(2+)-doped core, inverted core/shell, and isocrystalline core/shell nanocrystals reveal that the dominant spectroscopic effects caused by CdSe shell growth around doped ZnSe core nanocrystals arise from hole spatial relaxation, being essentially independent of the electron-dopant interaction or the heterointerface itself. The general criteria for observation of kinetic s-d exchange coupling in doped nanocrystals are discussed in light of these results.
Vlaskin
Vladimir A
VA
Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA.
Beaulac
Rémi
R
Gamelin
Daniel R
DR
D019187:Cadmium Compounds / Q000737:chemistry*; D003102:Colloids / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D004574:Electromagnetic Fields; D008280:Magnetics; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D018036:Selenium Compounds / Q000737:chemistry*; D012666:Semiconductors; D017967:Zinc Compounds / Q000737:chemistry*
D019187:Cadmium Compounds; D003102:Colloids; D018036:Selenium Compounds; D017967:Zinc Compounds; C058667:cadmium selenide; C044696:zinc selenide