Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 53: Poster Session: Superconductivity 1

TT 53.3: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P2-OG2

Rhenium-molybdenum coplanar superconducting electronics compatible with carbon nanotube growth — •Stefan Blien, Karl J. G. Götz, Thomas Huber, Niklas Hüttner, Wolfgang Himmler, and Andreas K. Hüttel — Institute for Experimental and Applied Physics, Universität Regensburg, Regensburg, Germany

At low temperature, carbon nanotubes act as quantum dots as well as nano-electromechanical resonators. By growing them in a last fabrication step over pre-existing chip structures, one obtains “ultraclean” devices, displaying high mechanical quality factors as well as unperturbed electronic transport spectra. For integrating such structures with superconducting coplanar circuits, superconductors that withstand the nanotube CVD growth process are needed.

We compare rhenium-molybdenum alloys of different composition and different deposition technique, regarding their material composition and both dc and GHz electronic properties. The rhenium-molybdenum thin films still display superconductivity after the CVD process, with critical temperatures up to T_c≃ 8 K. Coplanar waveguide resonators with Q_i≃ 5000 at dilution refrigerator temperature are characterized and and dissipation mechanisms discussed.