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TT: Fachverband Tiefe Temperaturen

TT 92: Transport – Poster

TT 92.7: Poster

Donnerstag, 12. März 2026, 18:00–20:00, P4

Nonlinear Nanomechanics in Suspended Carbon Nanotubes — •Philipp Bennett, Sophie Klingel, Julian Sehr, Tim Althuon, Tino Cubaynes und Wolfgang Wernsdorfer — Karlsruher Institut für Technologie, Karlsruhe, Germany

Suspended carbon nanotubes (CNTs) serve as a unique platform for the implementation of nanomechanical systems (NEMS), owing to their electrical, mechanical, and quantum properties in a single nanoscale object. Because of their well-defined quantum dot states and mechanical degree of freedom, suspended CNTs are attractive for studying the coupling between electronic transport and nanomechanics and as candidates for mechanical qubits.

Building a two-level phononic system at the quantum level requires a certain degree of nonlinearity. In contrast to other hybrid approaches, we rely on purely intrinsic nonlinearities, which minimizes the additional decoherence arising from external sources. The degree of intrinsic nonlinearity can be quantified via the ratio K/κ, with K being the Kerr nonlinearity and κ the decoherence rate of the resonator. Our group has recently measured the Kerr-constant for a purely mechanical system. The next step is to further reduce the decoherence rate κ. To this end, we follow two complementary strategies: enhancing CNT quality by introducing water during growth, and improving the readout by implementing an MHz-range RLC tank circuit in the dilution cryostat. These improvements are meant to boost the degree of intrinsic nonlinearity in our system, paving the way to various applications, like magnetometers for single-molecule magnets or mechanical qubits.

Keywords: Carbon Nanotubes; NEMS; nanomechanics