Quantum Friction of Micromechanical Resonators at Low Temperatures

Details Quantum Friction of Micromechanical Resonators at Low Temperatures Quantum Friction of Micromechanical Resonators at Low Temperatures

2003-01-15

arxiv.org/abs/cond-mat/0301255v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To apear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.90.085504

Dissipation of micro- and nano-scale mechanical structures is dominated by quantum-mechanical tunneling of two-level defects intrinsically present in the system. We find that at high frequencies--usually, for smaller, micron-scale structures--a novel mechanism of phonon pumping of two-level defects gives rise to weakly temperature-dependent internal friction, $Q^{-1}$, concomitant to the effects observed in recent experiments. Due to their size, comparable to or shorter than the emitted phonon wavelength, these structures suffer from superradiance-enhanced dissipation by the collective relaxation of a large number of two-level defects contained within the wavelength.

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