Coupling a single electron level to dissipative leads allows the study of unusual behaviour near a quantum critical point, including the fractionalization of the resonant level into two Majorana fermions.
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Peeters, L., Goldhaber-Gordon, D. A quantum critical approach. Nature Phys 9, 695–696 (2013). https://doi.org/10.1038/nphys2804
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DOI: https://doi.org/10.1038/nphys2804