We have investigated charge transfer properties in superconducting single-electron tunneling transistors with asymmetric tunnel junctions. The measured gate modulation curves in the Josephson-quasiparticle region show highly asymmetric and multi-peak features quite different from those of the normal Coulomb oscillation. These complex features in the modulation curves turn out to be due to the combined effect of Cooper pair resonance tunneling and junction asymmetry. The overall characteristics of the gate modulation curves are explained qualitatively by the Josephson-quasiparticle cycle and the resonant Cooper pair tunneling. Also, we have observed an apparent 2 e-oscillation in the supercurrent region resulting from the even-odd parity effect on the superconducting island.
|Number of pages||4|
|Journal||Journal of the Korean Physical Society|
|Publication status||Published - 1998|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)