Tunable magnetic exchange interactions in manganese-doped inverted core/shell ZnSe/CdSe nanocrystals

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dc.creatorBussian, David A.
dc.creatorCrooker, Scott A.
dc.creatorYin, Ming
dc.creatorBrynda, Marcin
dc.creatorEfros, Alexander L.
dc.creatorKlimov, Victor I.
dc.date2008-11-06
dc.date.accessioned2026-07-07T12:48:26Z
dc.date.available2026-07-07T12:48:26Z
dc.descriptionMagnetic doping of semiconductor nanostructures is actively pursued for applications in magnetic memory and spin-based electronics. Central to these efforts is a drive to control the interaction strength between carriers (electrons and holes) and the embedded magnetic atoms. In this respect, colloidal nanocrystal heterostructures provide great flexibility via growth-controlled `engineering' of electron and hole wavefunctions within individual nanocrystals. Here we demonstrate a widely tunable magnetic sp-d exchange interaction between electron-hole excitations (excitons) and paramagnetic manganese ions using `inverted' core-shell nanocrystals composed of Mn-doped ZnSe cores overcoated with undoped shells of narrower-gap CdSe. Magnetic circular dichroism studies reveal giant Zeeman spin splittings of the band-edge exciton that, surprisingly, are tunable in both magnitude and sign. Effective exciton g-factors are controllably tuned from -200 to +30 solely by increasing the CdSe shell thickness, demonstrating that strong quantum confinement and wavefunction engineering in heterostructured nanocrystal materials can be utilized to manipulate carrier-Mn wavefunction overlap and the sp-d exchange parameters themselves.
dc.descriptionTo appear in Nature Materials; 18 pages, 4 figures + Supp. Info
dc.identifierhttps://arxiv.org/abs/0811.1036
dc.identifierhttp://arxiv.org/abs/0811.1036
dc.identifierNature Materials v8, pp35-40 (2009)
dc.identifierdoi:10.1038/nmat2342
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/222052
dc.subjectMaterials Science
dc.subjectMesoscale and Nanoscale Physics
dc.titleTunable magnetic exchange interactions in manganese-doped inverted core/shell ZnSe/CdSe nanocrystals
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