When a tiny constriction is introduced into the path of electrons, the conductance becomes quantized. In many experiments an unexpected additional feature is observed. An explanation might now be available.
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Ensslin, K. Pinning down the last spin. Nature Phys 2, 587–588 (2006). https://doi.org/10.1038/nphys399
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DOI: https://doi.org/10.1038/nphys399
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Observation of low-loss broadband supermode propagation in coupled acoustic waveguide complex
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