Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 31: SC: Tunnelling, Josephson Junctions
TT 31.8: Talk
Thursday, March 25, 2010, 11:30–11:45, H21
Charge transport across a single-Cooper-pair transistor coupled to a resonant transmission line — •Juha Leppäkangas1,3, 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.