Motivated by recent experiments with proximitized nanowires, we study a mesoscopic s-wave superconductor connected via point contacts to normal-state leads. We demonstrate that at energies below the charging energy the system is described by the two-channel Kondo model, which can be brought to the quantum critical regime by varying the gate potential and conductances of the contacts.
@article{arxiv.1706.04726,
title = {Quantum Criticality in Resonant Andreev Conduction},
author = {M. Pustilnik and B. van Heck and R. M. Lutchyn and L. I. Glazman},
journal= {arXiv preprint arXiv:1706.04726},
year = {2017}
}