Dimensional control of tunneling two level systems in nanoelectromechanical resonators
| Autor: | T. Kamppinen, J. T. Mäkinen, V. B. Eltsov |
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| Přispěvatelé: | Topological Quantum Fluids, Department of Applied Physics, Aalto-yliopisto, Aalto University |
| Rok vydání: | 2021 |
| Předmět: |
Condensed Matter - Mesoscale and Nanoscale Physics
0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) FOS: Physical sciences 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 010306 general physics 0210 nano-technology 01 natural sciences |
| DOI: | 10.48550/arxiv.2110.10492 |
| Popis: | Tunneling two level systems affect damping, noise and decoherence in a wide range of devices, including nanoelectromechanical resonators, optomechanical systems, and qubits. Theoretically this interaction is usually described within the tunneling state model. The dimensions of such devices are often small compared to the relevant phonon wavelengths at low temperatures, and extensions of the theoretical description to reduced dimensions have been proposed, but lack conclusive experimental verification. We have measured the intrinsic damping and the frequency shift in magnetomotively driven aluminum nanoelectromechanical resonators of various sizes at millikelvin temperatures. We find good agreement of the experimental results with a model where the tunneling two level systems couple to flexural phonons that are restricted to one or two dimensions by geometry of the device. This model can thus be used as an aid when optimizing the geometrical parameters of devices affected by tunneling two level systems. Comment: 10 pages, 5 figures |
| Databáze: | OpenAIRE |
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