Journal
SCIENCE
Volume 325, Issue 5943, Pages 973-976Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1174419
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Funding
- US NSF [DMR-0239325]
- Dreyfus Foundation
- Sloan Foundation
- Natural Sciences and Engineering Research Council of Canada
- Deutsche Forschungsgemeinschaft [SFB 445]
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An attractive approach to controlling spin effects in semiconductor nanostructures for applications in electronics is the use of light to generate, manipulate, or read out spins. Here, we demonstrate spontaneous photoinduced polarization of manganese(II) spins in doped colloidal cadmium selenide quantum dots. Photoexcitation generates large dopant-carrier exchange fields, enhanced by strong spatial confinement, that lead to giant Zeeman splittings of the semiconductor band structure in the absence of applied magnetic fields. These internal exchange fields allow spontaneous magnetic saturation of the manganese(II) spins to be achieved at zero external magnetic field up to similar to 50 kelvin. Photomagnetic effects are observed all the way up to room temperature.
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