Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Nanotubes and Nanoribbons

TT 33.3: Vortrag

Dienstag, 13. März 2018, 10:00–10:15, H 0110

Carbon nanotube transfer into complex devices with commercial quartz tuning forks — •Patrick Steger, Alexander Albang, Stefan Blien, and Andreas K. Hüttel — Institute for Experimental and Applied Physics, University of Regensburg, 93040, Regensburg, Germany

For experiments in the GHz regime we intend to couple suspended, clean carbon nanotubes (CNTs) to a superconducting coplanar waveguide (CPW) resonator. However, device fabrication is still challenging. Wet chemical processing as well as plasma etching can cause contamination and defects in the nanotubes while the conditions during CVD needed for nanotube growth can destroy superconducting on-chip circuitry.

To increase our fabrication yield we have developed a fork transfer method that allows us to separate the CVD process for CNT growth from the rest of the device fabrication. CNTs are grown between the tips of a commercial quartz tuning fork. In a subsequent step the tubes are transferred to the device containing dc electrodes as well as superconducting RF circuitry. Our transfer setup allows in situ precharacterization of the CNT during the transfer process. When a suitable CNT is found, the transfer process is completed by cutting the tube with current pulses at both ends.

We show first results of CNTs successfully transferred to a niobium CPW resonator device. Transport measurements at millikelvin temperatures show characteristics of a low number of high quality nanotubes and confirm the feasibility of transparent contacts.