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    Quantum friction of micromechanical resonators at low temperatures

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    Date Issued
    2003-02-28
    Publisher Version
    10.1103/PhysRevLett.90.085504
    Author(s)
    Ahn, Kang-Hun
    Mohanty, Pritiraj
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    Permanent Link
    https://hdl.handle.net/2144/28339
    Citation (published version)
    Ahn, K. H., & Mohanty, P. (2003). Quantum friction of micromechanical resonators at low temperatures. Physical review letters, 90(8), 085504. doi: 10.1103/PhysRevLett.90.085504
    Abstract
    Dissipation of micro- and nanoscale 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. Because of 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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    ©2003 American Physical Society
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    • BU Open Access Articles [3730]
    • CAS: Physics: Scholarly Papers [356]


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