Multichannel charge Kondo effect and non-Fermi liquid fixed points in conventional and topological superconductor islands

Abstract

We study multiterminal Majorana and conventional superconducting islands in the vicinity of the charge degeneracy point using bosonization and numerical renormalization group. Both models map to the multichannel charge Kondo problem, but for noninteracting normal leads they flow to different non-Fermi liquid fixed points at low temperatures. We compare and contrast both cases by numerically obtaining the full crossover to the low temperature regime and predict distinctive transport signatures. We attribute the differences between both types of islands to a crucial distinction of charge-$2e$ and charge-$e$ transfer in the conventional and topological case, respectively. In the conventional case, our results establish s-wave islands as a new platform to study the intermediate multichannel Kondo fixed point. In the topological setup the crossover temperature to non-Fermi liquid behavior is relatively high as it is proportional to level broadening and the transport results are not sensitive to channel coupling anisotropy, moving away from the charge degeneracy point or including a small Majorana hybridization, which makes our proposal experimentally feasible.

14 pages, 10 figures

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Cited by in corpus (12)

• Josephson junctions in double nanowires bridged by in-situ deposited superconductors
• Topological Kondo Device for distinguishing Quasi-Majorana and Majorana signatures
• Multichannel topological Kondo effect
• Signatures of topological ground state degeneracy in Majorana islands
• Topological Kondo effect with spinful Majorana fermions
• The topological Kondo model out of equilibrium
• Double Fu-teleportation and anomalous Coulomb blockade in a Majorana-hosted superconducting island
• Strongly correlated electrons in superconducting islands with fluctuating Cooper pairs
• Embedded Majorana Islands
• Subgap states in superconducting islands
• Matrix product state simulations of quantum quenches and transport in Coulomb blockaded superconducting devices
• Electronic transport in double-nanowire superconducting islands with multiple terminals