Damping in high-frequency metallic nanomechanical resonators

Hoehne, F. and Pashkin, Yuri and Astafiev, O. and Faoro, L. and Ioffe, L. B. and Nakamura, Y. and Tsai, J. S. (2010) Damping in high-frequency metallic nanomechanical resonators. Physical review B, 81 (18). -. ISSN 1098-0121

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Abstract

We have studied damping in polycrystalline Al nanomechanical resonators by measuring the temperature dependence of their resonance frequency and quality factor over a temperature range of 0.1-4 K. Two regimes are clearly distinguished with a crossover temperature of 1 K. Below 1 K we observe a logarithmic temperature dependence of the frequency and linear dependence of damping that cannot be explained by the existing standard models. We attribute these phenomena to the effect of the two-level systems characterized by the unexpectedly long (at least two orders of magnitude longer) relaxation times and discuss possible microscopic models for such systems. We conclude that the dynamics of the two-level systems is dominated by their interaction with one-dimensional phonon modes of the resonators.

Item Type: Journal Article
Journal or Publication Title: Physical review B
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 57813
Deposited By: ep_importer_pure
Deposited On: 28 Aug 2012 13:56
Refereed?: Yes
Published?: Published
Last Modified: 05 Feb 2020 13:45
URI: https://eprints.lancs.ac.uk/id/eprint/57813

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