TiN薄膜超绝缘态的本征非线性导电
Intrinsic non-linear conduction in the super-insulating state of thin TiN films
摘要：
我们在实验上研究了TiN薄膜中超导体向绝缘体转变的绝缘侧的电输运。在温度T > 50 mK时，我们观察到一个Arrhenius型电导，其激活能依赖于样品尺寸。在高偏压下，电流-电压（I-V）特性显示大电流跳变到电子加热为主的制度。对于最大的样品，并且低于50 mK，我们观察到低偏置幂律I ~ V^α特性，其中指数α> 1随着温度的降低而快速增长，这是电荷Berezinskii-Kosterlitz-无电荷类型的结合-非结合交叉所期望的。
英文摘要：
We investigate experimentally the electric transport at the insulating side of the superconductor to insulator transition in thin TiN-films. At temperatures T > 50 mK we observe an Arrhenius-type conductance, with an activation energy depending logarithmically on the sample size. At high bias the current voltage (I-V) characteristics display a large current jump into an electron heating dominated regime. For the largest samples, and below 50 mK we observe a low-bias power law I ~ V^alpha characteristics with an exponent alpha > 1 rapidly growing with decreasing temperature, which is expected for a binding-unbinding crossover of the charge-Berezinskii-Kosterlitz-Thouless type.
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