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3e tunneling processes in a superconducting single-electron tunneling transistor

P. Hadley, E. Delvigne, E. H. Visscher, S. Lahteenmaki, J. E. Mooij

cond-mat.mes-hallarXiv:cond-mat/9807419

Abstract

A current due to a tunneling event that involves three times the charge of an electron was observed in the current - voltage characteristics of a superconducting single-electron tunneling transistor. In this tunnel event, a Cooper pair tunnels through one tunnel barrier simultaneously with a quasiparticle that tunnels through a second tunnel barrier which is about 0.5 microns distant from the first tunnel barrier. This current was observed in a bias regime where current flow due to sequential quasiparticle tunneling is forbidden due to the Coulomb blockade.

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