SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster: Superconductivity II
TT 58.31: Poster
Thursday, March 30, 2023, 15:00–18:00, P2/OG3
Modeling a vibrating carbon nanotube Josephson junction — •Andreas K. Hüttel1,2, Keijo Korhonen2, and Pertti Hakonen2 — 1Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany — 2Low Temperature Laboratory, Department of Applied Physics, Aalto University, P.O. Box 15100, 00076 Aalto, Finland
A carbon nanotube suspended between superconducting electrodes acts simultaneously as nanomechanical resonator and as a Josephson junction. Its energy-dependent density of states and with that position-dependent critical current further adds to the complexity of the system, as does both mechanical and electronic nonlinearity.
Using parallelized Julia code[1], we numerically solve the coupled differential equation system of the driven (via an ac gate voltage and/or ac current or voltage bias) system for realistic device parameters and characterize the evolving steady state. Specific attention is given to the impact of the Josephson junction behaviour on the mechanical resonance frequency and the vibration amplitude, and on the impact of the carbon nanotube motion on the phase evolution of the junction. [1] https://julialang.org/