Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 29: Transport: Poster Session

TT 29.2: Poster

Thursday, September 8, 2022, 15:00–18:00, P1

Manipulating molecular spins with carbon nanotube SQUIDs — •Tim Althuon, Aljoscha Auer, Tino Cubaynes, and Wolfgang Wernsdorfer — Karlsruher Institut für Technologie (KIT), 76131 Karlsruhe

Single-molecule magnets (SMMs) are promising candidates for spin-qubits due to their small size, cheap and reproducible chemical synthesis in a bottom-up approach and the opportunity to engineer their chemical properties such as the magnetic moment. However, an integration of SMMs with nanoscale diameters into electronic circuits is challenging. A solution to this problem could be to graft these molecules on carbon nanotubes (CNTs) which are comparable to SMMs in the diameter and possess unique sensing properties.

The CNT can be included as a weak-link Josephson junction into a superconducting quantum interference device (SQUID). Such a nano-SQUID is expected to have a large coupling between the magnetic moment of a molecule grafted on the CNT and the flux through the SQUID loop, giving rise to a very simple and precise detection of the spin of a single molecule.

Our CNTs are grown on separate chips with chemical vapor deposition and can then be integrated into prepatterned electronic circuits. For this purpose we use a novel, ultraclean, dry-transfer technique of CNTs where the CNTs are never exposed to air. This contribution will mainly focus on the integration of suspended CNTs into electronic circuits including preliminary results on the characterization of the devices at room and milli-Kelvin temperatures.