Anomalous Damping of a Microelectromechanical Oscillator in Superfluid ^{3}He-B.
Anomalous Damping of a Microelectromechanical Oscillator in Superfluid ^{3}He-B.
复制标题
超流体中微机电振荡器的反常阻尼^{3}He-B。
DOI：
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发表时间：
2016
影响因子：
8.6
通讯作者：
H. B. Chan
中科院分区：
文献类型：
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作者：
P. Zheng;W. G. Jiang;C. Barquist;Yoonseok Lee;H. B. Chan
研究了超流^{3}He-B中间隙为1.25 μm的微机电振荡器在不同压力下的机械谐振特性。振子在线性阻尼区中被驱动，其中阻尼系数与振子速度无关。振荡器的品质因数低至0.1T_{c}（Q = 80），比真空中测量的本征品质因数低4个数量级。除了玻尔兹曼温度依赖的贡献的阻尼，阻尼成比例的温度被发现在低温下占主导地位。我们提出了一个多重散射机制的表面Andreev束缚态是一个可能的原因异常阻尼。
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.
影响因子：
2
作者：
D. Bradley;P. Crookston;S. Fisher;A. Ganshin;A. M. Guénault;R. Haley;M. Jackson;G. Pickett;R. Schanen;V. Tsepelin
通讯作者：
D. Bradley;P. Crookston;S. Fisher;A. Ganshin;A. M. Guénault;R. Haley;M. Jackson;G. Pickett;R. Schanen;V. Tsepelin