库珀对绝缘体中巨正磁电阻效应的观察
Observation of Giant Positive Magnetoresistance in a Cooper Pair Insulator
摘要：
超薄非晶Bi薄膜，图案化与纳米蜂窝阵列的孔，可以表现出绝缘相与输运占主导地位的非相干运动的库珀对的电子之间的本地化状态。在这里，我们表明，这库珀对绝缘体相的磁阻是积极的，并随着温度的降低呈指数增长，温度远低于对形成温度。它的峰值估计是足以打破对，然后单调下降到一个制度，其中膜电阻假设的温度依赖性弱本地化的单电子输运适当的领域。我们讨论了这些结果如何支持建议，在其他未图案化的大MR峰，磁共振膜系统公开了一个库珀对绝缘体阶段，并提供新的见解到库珀对本地化。
英文摘要：
Ultrathin amorphous Bi films, patterned with a nano-honeycomb array of holes, can exhibit an insulating phase with transport dominated by the incoherent motion of Cooper pairs of electrons between localized states. Here we show that the magnetoresistance of this Cooper pair insulator phase is positive and grows exponentially with decreasing temperature, for temperatures well below the pair formation temperature. It peaks at a field estimated to be sufficient to break the pairs and then decreases monotonically into a regime in which the film resistance assumes the temperature dependence appropriate for weakly localized single electron transport. We discuss how these results support proposals that the large MR peaks in other unpatterned, ultrathin film systems disclose a Cooper Pair Insulator phase and provide new insight into the Cooper pair localization.
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