Quantum Friction in Nanomechanical Oscillators at Millikelvin Temperatures

Details Quantum Friction in Nanomechanical Oscillators at Millikelvin Temperatures Quantum Friction in Nanomechanical Oscillators at Millikelvin Temperatures

2006-03-25

arxiv.org/abs/cond-mat/0603691v1

Phys. Rev. B 72, 224101 (2005)

Physics

Condensed Matter

Other Condensed Matter

5 pages, two-column format. Related papers available at http://nano.bu.edu

Scientific paper

10.1103/PhysRevB.72.224101

We report low-temperature measurements of dissipation in megahertz-range, suspended, single-crystal nanomechanical oscillators. At millikelvin temperatures, both dissipation (inverse quality factor) and shift in the resonance frequency display reproducible features, similar to those observed in sound attenuation experiments in disordered glasses and consistent with measurements in larger micromechanical oscillators fabricated from single-crystal silicon. Dissipation in our single-crystal nanomechanical structures is dominated by internal quantum friction due to an estimated number of roughly 50 two-level systems, which represent both dangling bonds on the surface and bulk defects.

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