Odd-denominator fractional quantum Hall states are routinely observed in high-mobility gallium arsenide heterostructures. Now, a 5/2 state has been observed in an oxide heterostructure — an unexpected state in an unexpected material.
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Dean, C. Even denominators in odd places. Nature Phys 11, 298–299 (2015). https://doi.org/10.1038/nphys3298
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DOI: https://doi.org/10.1038/nphys3298