Dissipation due to tunneling two-level systems in gold nanomechanical resonators - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




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Abstract: We present measurements of the dissipation and frequency shift innanomechanical gold resonators at temperatures down to 10 mK. The resonatorswere fabricated as doubly-clamped beams above a GaAs substrate and actuatedmagnetomotively. Measurements on beams with frequencies 7.95 MHz and 3.87 MHzrevealed that from 30 mK to 500 mK the dissipation increases with temperatureas $T^{0.5}$, with saturation occurring at higher temperatures. The relativefrequency shift of the resonators increases logarithmically with temperature upto at least 400 mK. Similarities with the behavior of bulk amorphous solidssuggest that the dissipation in our resonators is dominated by two-levelsystems.



Author: A. Venkatesan, K. J. Lulla, M. J. Patton, A. D. Armour, C. J. Mellor, J. R. Owers-Bradley

Source: https://arxiv.org/



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