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The emission of circularly polarized light from a single quantum dot relieson the injection of carriers with well-defined spin polarization. Here wedemonstrate single dot electroluminescence (EL) with a circular polarizationdegree up to 35% at zero applied magnetic field. The injection of spinpolarized electrons is achieved by combining ultrathin CoFeB electrodes on topof a spin-LED device with p-type InGaAs quantum dots in the active region. Wemeasure an Overhauser shift of several $\mu$eV at zero magnetic field for thepositively charged exciton (trion X$^+$) EL emission, which changes sign as wereverse the injected electron spin orientation. This is a signature of dynamicpolarization of the nuclear spins in the quantum dot induced by the hyperfineinteraction with the electrically injected electron spin. This study paves theway for electrical control of nuclear spin polarization in a single quantum dotwithout any external magnetic field.

Electrical initialization of electron and nuclear spins in a single quantum dot at zero magnetic field