超流$^3$ He-B中微机电振荡器的反常阻尼
Anomalous Damping of a Micro-electro-mechanical Oscillator in Superfluid $^3$He-B
摘要：
研究了超流$^3$ He-B中间隙为1.25 $μ$ m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。振荡器的品质因数保持低（$Q\approx 80$），低至0.1 $T_c$，比在4 K真空中测量的本征品质因数小4个数量级。除了波尔兹曼温度对阻尼的贡献之外，还发现与温度成正比的阻尼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。
英文摘要：
The mechanical resonance properties of a micro-electro-mechanical oscillator with a gap of 1.25 $μ$m 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 ($Q\approx 80$) down to 0.1 $T_c$, 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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