Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 73: Superconductivity: Tunneling and Josephson Junctions
TT 73.4: Vortrag
Donnerstag, 12. März 2026, 10:15–10:30, CHE/0089
Non-Linear Response Theory of the Josephson Effect — •Christian R. Ast1 and Juan Carlos Cuevas2 — 1MPI for Solid State Research, Stuttgart — 2Universidad Autónoma de Madrid, Spain
The dissipationless supercurrent in the Josephson effect depends linearly on the junction conductance in a planar superconductor-insulator-superconductor tunnel junction, if there is no interaction with the environment. In ultrasmall tunnel junctions, such as in a scanning tunneling microscope (STM), the interaction with the environment cannot be neglected, which leads to a dissipative supercurrent that depends quadratically on the junction conductance. This dissipative supercurrent has been very successfully modeled within the dynamical Coulomb blockade and P(E)-theory based on Fermi’s golden rule. In this talk, I will present a derivation of the dissipative supercurrent based on non-linear response theory. The result is basically identical to the existing model, although there are some distinct differences, which will be discussed.
Keywords: Josephson Effect; Scanning Tunneling Microscopy; Non-Linear Response Theory; Dynamical Coulomb blockade