颗粒微波谐振器中的随机电报涨落
Random telegraph fluctuations in granular microwave resonators
AI总结：
本文测量高正常态电阻的超导颗粒铝微波谐振器，在1/f噪声之外发现类似随机电报信号的过量噪声，并揭示其依赖电阻率与温度而非微波功率。
摘要：
无序超导体的微波电路电动力学是一个非常活跃的研究课题，催生了广泛的实验与应用。对于紧凑型超导电路元件，向绝缘态的转变限制了可获得的最大动态电感。因此，研究接近该转变的薄膜的基本噪声特性至关重要，尤其是在需要良好相干性和时间稳定性的情况下。在本文中，我们展示了对具有高正常态电阻的超导颗粒铝微波谐振器的测量，其中可以观察到超导体到绝缘体相变的影响。我们追踪了基频谐振频率的涨落，除了1/f噪声模式外，还观察到一种明显的过量噪声，类似于随机电报信号。该过量噪声表现出对薄膜电阻率以及样品温度的强烈依赖，但与所施加的微波功率无关。
英文摘要：
Microwave circuit electrodynamics of disordered superconductors is a very active research topic spawning a wide range of experiments and applications. For compact superconducting circuit elements, the transition to an insulating state poses a limit to the maximum attainable kinetic inductance. It is therefore vital to study the fundamental noise properties of thin films close to this transition, particularly in situations where a good coherence and temporal stability is required. In this paper, we present measurements on superconducting granular aluminum microwave resonators with high normal state resistances, where the influence of the superconductor to insulator phase transition is visible. We trace fluctuations of the fundamental resonance frequency and observe, in addition to a 1/f noise pattern, a distinct excess noise, reminiscent of a random telegraph signal. The excess noise shows a strong dependency on the resistivity of the films as well as the sample temperature, but not on the applied microwave power.
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