A neat experiment shows that if a current is sent through one of two adjacent conducting layers placed in a strong magnetic field, a quantum effect generates an exactly equal but opposite current in the other layer. See Letter p.481
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References
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Girvin, S. Electrons in perfect drag. Nature 488, 464–465 (2012). https://doi.org/10.1038/488464a
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DOI: https://doi.org/10.1038/488464a