Dopant−Carrier Magnetic Exchange Coupling in Colloidal Inverted Core/Shell Semiconductor Nanocrystals
2009; American Chemical Society; Volume: 9; Issue: 12 Linguagem: Inglês
10.1021/nl9026499
ISSN1530-6992
AutoresVladimir A. Vlaskin, Rémi Beaulac, Daniel R. Gamelin,
Tópico(s)ZnO doping and properties
ResumoDopant−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 Co2+- and Mn2+-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.
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