We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Tunable magnetic exchange interactions in manganese-doped inverted core–shell ZnSe–CdSe nanocrystals.
- Authors
Bussian, David A.; Crooker, Scott A.; Ming Yin; Brynda, Marcin; Efros, Alexander L.; Klimov, Victor I.
- Abstract
Magnetic 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 through growth-controlled ‘engineering’ of electron and hole wavefunctions in 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 Mn2+-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 used to manipulate carrier–Mn2+ wavefunction overlap and the sp–d exchange parameters themselves.
- Subjects
NANOCRYSTALS; SEMICONDUCTORS; MAGNETIC memory (Computers); ELECTRONICS; NANOSTRUCTURES; HETEROSTRUCTURES
- Publication
Nature Materials, 2009, Vol 8, Issue 1, p35
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat2342