Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 59: Transport: Poster
TT 59.3: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster E
Nanomechanics with nanoassembled carbon nanotubes circuits — •Sophie Klingel1, Tim Althuon1, Tino Cubaynes1,2, Aljoscha Auer1, Christoph Sürgers1, and Wolfgang Wernsdorfer1,2 — 1Physikalisches Institut (PHI), Karlsruhe Institute of Technology — 2Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology
Carbon nanotubes (CNT) are a one dimensional allotrope of elemental carbon which feature a unique combination of properties like low mass and high mechanical tensile strength, resulting in resonance frequencies suited for experiments. In combination with a high electronic tunability, these properties make CNT excellent components for nanoelectromechanical systems (NEMS). One possibility to create a NEMS is with a double quantum dot in a suspended CNT.
In our experiments, we connected a CNT grown on a separate chip to the contact electrodes via a mechanical nanoassembly technique. While this technique allows to select and place a single CNT on a precise location, the resistance between the CNT and the electrode was until now high, blocking access to the open quantum dot regime. We managed to drastically lower the resistance between the CNT and the electrode by developing a novel two-step annealing technique based on current-induced and radiative thermal annealing steps. Along with a more detailed presentation of this technique, some of our nanomechanical and quantum transport measurement results will be showcased.
Keywords: Carbon nanotubes; Quantum transport; Nanomechanics; Superconductivity; Nanoassembly technique