We report the experimental observation of the recently predicted peaks on the I-V curve of the superconducting single-electron transistor at relatively high temperatures. The peaks are due to the matching of singularities in the quasiparticle density of states in two electrodes of a tunnel junction. The energy shift due to Coulomb blockade provides the matching at finite voltage.
@article{arxiv.cond-mat/9704224,
title = {Singularity-matching peaks in superconducting single-electron transistor},
author = {Y. Nakamura and A. N. Korotkov and C. D. Chen and J. S. Tsai},
journal= {arXiv preprint arXiv:cond-mat/9704224},
year = {2009}
}