The conventional approach to flipping electron spins in a semiconductor requires an external alternating field. It seems that the same job can be accomplished without external excitation of any kind.
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Vandersypen, L. Bouncing spins. Nature 458, 841–843 (2009). https://doi.org/10.1038/458841a
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DOI: https://doi.org/10.1038/458841a
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