论文标题
超导性发作附近的模拟粘性电流流
Analogue viscous current flow near the onset of superconductivity
论文作者
论文摘要
二维量子材料中的空间分辨转运可以揭示动态，这在常规散装运输测量中是看不见的。我们预测二维超导薄膜在临界温度上方的空间不均匀运输中的惊人模式，在这种情况下，电流似乎是一种粘性的流体，就像粘性的流体一样，遵守Navier-Stokes方程。与诸如石墨烯之类的超纯金属中的粘性电子流体相比，这种模拟粘性涡流流体可以表现出更可调的跨界，这是从欧姆到非欧马传输的函数，后者在越来越大的长度尺度上产生。使用氮空位中心磁力测定法或通过图案化薄膜传输的实验可以揭示这种模拟粘性在多种材料中。
Spatially resolved transport in two-dimensional quantum materials can reveal dynamics which is invisible in conventional bulk transport measurements. We predict striking patterns in spatially inhomogeneous transport just above the critical temperature in two-dimensional superconducting thin films, where electrical current will appear to flow as if it were a viscous fluid obeying the Navier-Stokes equations. Compared to viscous electron fluids in ultrapure metals such as graphene, this analogue viscous vortex fluid can exhibit a far more tunable crossover, as a function of temperature, from Ohmic to non-Ohmic transport, with the latter arising on increasingly large length scales close to the critical temperature. Experiments using nitrogen vacancy center magnetometry, or transport through patterned thin films, could reveal this analogue viscous flow in a wide variety of materials.
