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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.58: Poster
Montag, 17. März 2025, 15:00–18:00, P4
Cavity Optomechanics with a Carbon Nanotube Nanomechanical Resonator — •Katrin Burkert, Akong Loh, Furkan Özyigit, Fabian Stadler, Anton Weber, Niklas Hüttner, and Andreas K. Hüttel — Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany
Carbon nanotubes (CNTs) are the smallest and lightest nanomechanical resonators. Suspended between Ti/Au electrodes and gated, they can act simultaneously as beam resonators with large Q and as quantum dots. We have realized optomechanical coupling of a SWCNT nanomechanical resonator to a microwave cavity and quantified it through optomechanically induced transparency measurements [1,2]. The nonlinearity of Coulomb blockade in the CNT was exploited to significantly enhance the coupling strength, reaching g0∼100 Hz [1,2]; also back-action of the CNT on the microwave cavity has been demonstrated [1,2]. Ongoing work is directed towards strong coupling and ground state cooling of the nanomechanical resonator. This requires improvements of the microwave cavity [3] and the transfer assembly procedure. Suspended CNTs have been proposed as long-lived nano-electromechanical qubits [4], a topic of high current research interest [5].
[1] S. Blien et al., Nat. Commun. 11, 1636 (2020).
[2] N. Hüttner et al., PR Appl. 20, 064019 (2023).
[3] N. Kellner et al., PSSB 260, 2300187 (2023).
[4] F. Pistolesi et al., PRX 11, 031027 (2021).
[5] Y. Yang et al., Science 386, 783 (2024).
Keywords: carbon nanotubes; microwave cavity; nanomechanics; optomechanics