Abstract
The rapid rise of spintronics and quantum information science has led to a strong interest in developing the ability to coherently manipulate electron spins1. Electron spin resonance2 is a powerful technique for manipulating spins that is commonly achieved by applying an oscillating magnetic field. However, the technique has proven very challenging when addressing individual spins3,4,5. In contrast, by mixing the spin and charge degrees of freedom in a controlled way through engineered non-uniform magnetic fields, electron spin can be manipulated electrically without the need of high-frequency magnetic fields6,7. Here we report experiments in which electrically driven addressable spin rotations on two individual electrons were realized by integrating a micrometre-size ferromagnet into a double-quantum-dot device. We find that it is the stray magnetic field of the micromagnet that enables the electrical control and spin selectivity. The results suggest that our approach can be tailored to multidot architecture and therefore could open an avenue towards manipulating electron spins electrically in a scalable way.
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Acknowledgements
We thank F. H. L. Koppens and C. Buizert for discussions, I. Mahboob for comments and Y. Sekine for advice. S.T. acknowledges financial support from Grants-in-Aid for Scientific Research S (No 19104007) and B (No 18340081).
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M.P.-L. designed the experiment, fabricated the device and wrote the paper. T.O. ensured proper operation of microwaves. M.P.-L. and T.O. carried out the bulk of the experimental work and analysis. Y.T. conceived the theory. Y.-S.S. participated in experiments. T.K. participated in the theoretical work. K.Y. assisted with device processing. T.T. assisted with micromagnet technology. S.T. planned the project. All authors discussed the results and commented on the manuscript.
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Pioro-Ladrière, M., Obata, T., Tokura, Y. et al. Electrically driven single-electron spin resonance in a slanting Zeeman field. Nature Phys 4, 776–779 (2008). https://doi.org/10.1038/nphys1053
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DOI: https://doi.org/10.1038/nphys1053
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