Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 31: SC: Tunnelling, Josephson Junctions

TT 31.8: Vortrag

Donnerstag, 25. März 2010, 11:30–11:45, H21

Charge transport across a single-Cooper-pair transistor coupled to a resonant transmission line — •Juha Leppäkangas^1,3, Yuri Pashkin², and Erkki Thuneberg³ — ¹Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany — ²NEC Nano Electronics Research Laboratories and RIKEN Advanced Science Institute, Tsukuba, Ibaraki 305-8501, Japan — ³Department of Physical Sciences, University of Oulu, FI-90014 Oulu, Finland

We have investigated charge transport in ultrasmall superconducting single and double Josephson junctions coupled to a transmission-line resonator. The microstrip resonator is naturally formed by the on-chip leads and the sample holder. We observe equidistant peaks in the transport characteristics of both types of devices and attribute them to the process involving simultaneous tunneling of Cooper pairs and photon emission into the resonator. The experimental data is well reproduced with the orthodox model of Cooper pair tunneling that accounts for the microwave photon emission into the resonator.