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• W2471512450 abstract "We study how the non-Fermi-liquid nature of the overscreened multichannel Kondo impurity model affects the response to a BCS pairing term that, in the absence of the impurity, opens a gap $mathrm{ensuremath{Delta}}$. We find that the low-energy spectrum in the limit $mathrm{ensuremath{Delta}}ensuremath{rightarrow}0$ actually does not correspond to the spectrum strictly at $mathrm{ensuremath{Delta}}=0$. In particular, in the two-channel Kondo model, the $mathrm{ensuremath{Delta}}ensuremath{rightarrow}0$ ground state is an orbitally degenerate spin singlet, while it is an orbital singlet with a residual spin degeneracy at $mathrm{ensuremath{Delta}}=0$. In addition, there are fractionalized spin-1/2 subgap excitations whose energy in units of $mathrm{ensuremath{Delta}}$ tends toward a finite and universal value when $mathrm{ensuremath{Delta}}ensuremath{rightarrow}0$, as if the universality of the anomalous power-law exponents that characterize the overscreened Kondo effect turned into universal energy ratios when the scale invariance is broken by $mathrm{ensuremath{Delta}}ensuremath{ne}0$. This intriguing phenomenon can be explained by the renormalization flow toward the overscreened fixed point and the gap cutting off the orthogonality catastrophe singularities. We also find other non-Fermi-liquid features at finite $mathrm{ensuremath{Delta}}$: the local density of states lacks coherence peaks, the states in the continuum above the gap are unconventional, and the boundary entropy is a nonmonotonic function of temperature. The persistent subgap excitations are characteristic of the non-Fermi-liquid fixed point of the model, and thus depend on the impurity spin and the number of screening channels." @default.
• W2471512450 created "2016-07-22" @default.
• W2471512450 creator A5027048384 @default.
• W2471512450 creator A5062380534 @default.
• W2471512450 date "2017-02-16" @default.
• W2471512450 modified "2023-10-10" @default.
• W2471512450 title "Non-Fermi-liquid behavior in quantum impurity models with superconducting channels" @default.
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• W2471512450 doi "https://doi.org/10.1103/physrevb.95.085121" @default.
• W2471512450 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5424882" @default.
• W2471512450 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28503673" @default.
• W2471512450 hasPublicationYear "2017" @default.
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