Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Transport: Poster Session

TT 58.36: Poster

Mittwoch, 9. März 2016, 15:00–18:30, Poster D

Stamp transfer of carbon nanotubes for nano-electromechanics — Dominik Berndt, Patrick Steger, Julian Heger, Karl Götz, Korbinian Mühlberger, Nicola Paradiso, Christoph Strunk, and •Andreas K. Hüttel — Institute for Experimental and Applied Physics, Universität Regensburg, Regensburg, Germany

Growing “ultraclean” carbon nanotubes via chemical vapour deposition (CVD) over pre-existing contact structures involves high temperatures (∼ 900^∘C) and aggressive gases (CH₄ and H₂). Consequently this procedure imposes many limitations on the choice of the contact material, in particular regarding superconductors. Many metal thin films are either destroyed during the CVD-process or lose superconducting properties. The alternative explored here is to grow the carbon nanotubes on a separate chip and mechanically transfer them to the Si/SiO₂ chip with contact electrodes. We use a stamping procedure, growing nanotubes on a transparent SiO₂ substrate which is subsequently pressed onto the electrode chip. There the nanotubes are suspended over superconducting Nb contacts with a thickness of 100 nm, separated by a 500nm wide trench. In low temperature transport, we examine gate dependence of the conductance, influences of the superconducting contacts, and mechanical features of the transferred nanotubes. The transfer method can be used for all those applications requiring materials that would not withstand the CVD growth conditions.