We investigate the properties of a hybrid single-electron transistor, involving a small superconducting island sandwiched between normal metal leads, which is driven by dc plus ac voltages. In order to describe its properties we derive from the microscopic theory a set of coupled equations. They consist of a master equation for the probability to find excess charges on the island, with rates depending on the distribution of nonequilibrium quasiparticles. Their dynamics follows from a kinetic equation which accounts for the excitation by single-electron tunneling as well as the relaxation and eventual recombination due to the interaction with phonons. Our low-temperature results compare well with recent experimental findings obtained for ac-driven hybrid single-electron turnstiles.
|Journal||Physical Review B: Condensed Matter and Materials Physics|
|Publication status||Published - 2014|
|MoE publication type||A1 Journal article-refereed|
Heimes, A., Maisi, V. F., Golubev, D. S., Marhaler, M., Schön, G., & Pekola, J. P. (2014). Tunnneling and relaxation of single quasiparticles in a normal-superconductor-normal single-electron transistor. Physical Review B: Condensed Matter and Materials Physics, 89(1), . https://doi.org/10.1103/PhysRevB.89.014508