Theory of coherent quantum phase-slips in Josephson junction chains with periodic spatial modulations
Superconductivity
2018-04-04 v2 Mesoscale and Nanoscale Physics
Abstract
We study coherent quantum phase-slips which lift the ground state degeneracy in a Josephson junction ring, pierced by a magnetic flux of the magnitude equal to half of a flux quantum. The quantum phase-slip amplitude is sensitive to the normal mode structure of superconducting phase oscillations in the ring (Mooij-Sch\"on modes). These, in turn, are affected by spatial inhomogeneities in the ring. We analyze the case of weak periodic modulations of the system parameters and calculate the corresponding modification of the quantum phase-slip amplitude.
Keywords
Cite
@article{arxiv.1711.09755,
title = {Theory of coherent quantum phase-slips in Josephson junction chains with periodic spatial modulations},
author = {Aleksandr E. Svetogorov and Masahiko Taguchi and Yasuhiro Tokura and Denis M. Basko and Frank W. J. Hekking},
journal= {arXiv preprint arXiv:1711.09755},
year = {2018}
}