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- W2791420166 abstract "The emission of circularly polarized light from a single quantum dot relies on the injection of carriers with well-defined spin polarization. Here we demonstrate single dot electroluminescence (EL) with a circular polarization degree up to 35% at zero applied magnetic field. The injection of spin-polarized electrons is achieved by combining ultrathin CoFeB electrodes on top of a spin-LED device with p-type InGaAs quantum dots in the active region. We measure an Overhauser shift of several microelectronvolts at zero magnetic field for the positively charged exciton (trion X+) EL emission, which changes sign as we reverse the injected electron spin orientation. This is a signature of dynamic polarization of the nuclear spins in the quantum dot induced by the hyperfine interaction with the electrically injected electron spin. This study paves the way for electrical control of nuclear spin polarization in a single quantum dot without any external magnetic field." @default.
- W2791420166 created "2018-03-29" @default.
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- W2791420166 date "2018-03-08" @default.
- W2791420166 modified "2023-10-18" @default.
- W2791420166 title "Electrical Initialization of Electron and Nuclear Spins in a Single Quantum Dot at Zero Magnetic Field" @default.
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- W2791420166 doi "https://doi.org/10.1021/acs.nanolett.7b05351" @default.
- W2791420166 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29517243" @default.
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