Tunneling and relaxation of single quasiparticles in a normal-superconductor-normal single-electron transistor

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2014
Major/Subject
Mcode
Degree programme
Language
en
Pages
014508/1-13
Series
Physical Review B, Volume 89, Issue 1
Abstract
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.
Description
Keywords
hybrid single-electron transistors, superconducting islands, metal leads
Other note
Citation
Heimes, Andreas & Maisi, Ville F. & Golubev, Dmitri S. & Marthaler, Michael & Schön, Gerd & Pekola, Jukka. 2014. Tunneling and relaxation of single quasiparticles in a normal-superconductor-normal single-electron transistor. Physical Review B. Volume 89, Issue 1. 014508/1-13. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.89.014508.