Electrons with fractional dimension have been observed in an artificial Sierpiński triangle, demonstrating their quantum fractal nature.
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Bercioux, D., Iñiguez, A. Quantum fractals. Nature Phys 15, 111–112 (2019). https://doi.org/10.1038/s41567-018-0327-1
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DOI: https://doi.org/10.1038/s41567-018-0327-1
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