颗粒铝中反常场效应与介观电导涨落的共存
Coexistence of anomalous field effect and mesoscopic conductance fluctuations in granular aluminium
摘要：
我们在4 K下对绝缘颗粒状铝薄膜进行了电场效应测量。当样品尺寸减小到100微米以下时，可再现且稳定的电导波动被视为栅极电压的函数。我们的研究结果表明，这些波动反映了不完全的自我平均的大部分分布的微观电阻。我们还研究了异常场效应（电导下降）已经知道退出在大样品和其缓慢的电导弛豫的电导波动的存在下。在我们的测量精度范围内，这两种现象似乎是相互独立的，就像电导的两个附加贡献一样。我们讨论了这种独立性的可能的物理意义，特别是这种观察是否有利于慢电导异常弛豫的电子玻璃解释。
英文摘要：
We perform electrical field effect measurements at 4 K on insulating granular aluminium thin films. When the samples size is reduced below 100 micrometers, reproducible and stable conductance fluctuations are seen as a function of the gate voltage. Our results suggest that these fluctuations reflect the incomplete self-averaging of largely distributed microscopic resistances. We also study the anomalous field effect (conductance dip) already known to exit in large samples and its slow conductance relaxation in the presence of the conductance fluctuations. Within our measurements accuracy, the two phenomena appear to be independent of each other, like two additive contributions to the conductance. We discuss the possible physical meaning of this independence and in particular whether or not this observation is in favor of an electron glass interpretation of slow conductance anomaly relaxations.
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