利用拖曳电阻研究薄膜中的超导体-绝缘体转变：一个实验的理论分析
Investigating superconductor-insulator transition in thin films using drag resistance:Theoretical analysis of a proposed experiment
摘要：
非晶薄膜（例如，InO，Ta）的磁电阻效应表现出一些神秘的现象，如金属相和巨大的磁电阻峰。不幸的是，几个相互冲突的理论类别，特别是量子涡旋凝聚和正常区域渗透，同样很好地解释了关键的观察结果。我们提出了一个新的实验装置，一个非晶薄膜双层，其中阻力测量将澄清量子涡旋在过渡中发挥的作用，因此果断地指向正确的图片。我们提供了一个彻底的分析的设备，这表明，涡流范例引起的阻力与相反的符号和数量级大于阻力测量，如果竞争的范例适用。
英文摘要：
The magnetically driven superconductor-insulator transition in amorphous thin films (e.g., InO, Ta) exhibits several mysterious phenomena, such as a putative metallic phase and a huge magnetoresistance peak. Unfortunately, several conflicting categories of theories, particularly quantum-vortex condensation, and normal region percolation, explain key observations equally well. We propose a new experimental setup, an amorphous thin-film bilayer, where a drag resistance measurement would clarify the role quantum vortices play in the transition, and hence decisively point to the correct picture. We provide a thorough analysis of the device, which shows that the vortex paradigm gives rise to a drag with an opposite sign and orders of magnitude larger than the drag measured if competing paradigms apply.
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