Optomechanical Coupling and Damping of a Carbon Nanotube Quantum Dot
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-12
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en
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18
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Physical Review Applied, Volume 20, issue 6, pp. 1-18
Abstract
Carbon nanotubes are excellent nanoelectromechanical systems, combining high resonance frequency, low mass, and large zero-point motion. At cryogenic temperatures they display high mechanical quality factors. Equally they are outstanding single-electron devices with well-known quantum levels and have been proposed for the implementation of charge or spin qubits. However, the integration of these devices into microwave optomechanical circuits is hindered by a mismatch of scales between typical microwave wavelengths, nanotube segment lengths, and nanotube deflections. As experimentally demonstrated recently by Blien et al. [Nat. Comm. 11, 1363 (2020)], coupling enhancement via the quantum capacitance allows this restriction to be circumvented. Here we extend the discussion of this experiment. We present the subsystems of the device and their interactions in detail. An alternative approach to the optomechanical coupling is presented, allowing the mechanical zero-point motion scale to be estimated. Further, the mechanical damping is discussed, hinting at hitherto unknown interaction mechanisms.Description
Funding Information: The authors acknowledge funding by the Deutsche Forschungsgemeinschaft via grants Hu 1808/1 (project ID 163841188), Hu 1808/4 (project ID 438638106), Hu 1808/5 (project ID 438640202), SFB 631 (project ID 5485864), SFB 689 (project ID 14086190), SFB 1277 (project ID 314695032), and GRK 1570 (project ID 89249669). A.K.H. acknowledges support from the Visiting Professor program of the Aalto University School of Science. We would like to thank O. Vavra, F. Stadler, and F. Özyigit for experimental help, P. Hakonen for insightful discussions, and Ch. Strunk and D. Weiss for the use of experimental facilities. The data has been recorded using Lab::Measurement . Publisher Copyright: © 2023 American Physical Society.
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Hüttner, N, Blien, S, Steger, P, Loh, A N, Graaf, R & Hüttel, A K 2023, ' Optomechanical Coupling and Damping of a Carbon Nanotube Quantum Dot ', Physical Review Applied, vol. 20, no. 6, 064019, pp. 1-18 . https://doi.org/10.1103/PhysRevApplied.20.064019