In the fractional quantum Hall effect, the quasiparticles carry fractional charge. But neutral excitations with fractional spin have been elusive in two-dimensional magnets. Is it possible that they have already been observed?
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McKenzie, R. 2D or not 2D?. Nature Phys 3, 756–758 (2007). https://doi.org/10.1038/nphys768
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DOI: https://doi.org/10.1038/nphys768