Europhysics Letters (EPL)
Two-quasiparticle tunneling in all-superconducting single-electron transistors
Jens Siewert
Abstract
We study coherent two-quasiparticle tunneling in all-superconducting single-electron transistors in the framework of the tunneling Hamiltonian formalism. We discuss the interplay of the two-quasiparticle transfer and the superposition of charge states due to Cooper-pair transitions and calculate the tunneling rate. By using this rate in a master equation we compute complete current-voltage characteristics which we compare to recent experimental results.