Zheng P, Jiang WG, Barquist CS, Lee Y, Chan HB. Anomalous Damping of a Microelectromechanical Oscillator in Superfluid ^{3}He-B.
Phys Rev Lett 2016;
117:195301. [PMID:
27858447 DOI:
10.1103/physrevlett.117.195301]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Indexed: 06/06/2023]
Abstract
The mechanical resonance properties of a microelectromechanical oscillator with a gap of 1.25 μm was studied in superfluid ^{3}He-B at various pressures. The oscillator was driven in the linear damping regime where the damping coefficient is independent of the oscillator velocity. The quality factor of the oscillator remains low (Q≈80) down to 0.1T_{c}, 4 orders of magnitude less than the intrinsic quality factor measured in vacuum at 4 K. In addition to the Boltzmann temperature dependent contribution to the damping, a damping proportional to temperature was found to dominate at low temperatures. We propose a multiple scattering mechanism of the surface Andreev bound states to be a possible cause for the anomalous damping.
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