论文标题
肮脏的NB-C超导体中的超快速涡旋运动，近距离边缘屏障
Ultra-fast vortex motion in dirty Nb-C superconductor with a close-to-perfect edge barrier
论文作者
论文摘要
超导涡流的超快速动力学具有富含质量集体系统的丰富物理学。但是，通量流不稳定性（FFI）的现象阻止了其探索，并设定了在各种应用中使用涡流的实际限制。为了抑制FFI，超导体应表现出很少达到的特性组合：较弱的体积固定，近距离驱动的临界电流以及从加热电子中快速去除热量。在这里，我们在直接书面的NB-C超导体中以10-15 km/s的速度进行实验性超快速涡旋运动，在该速度上，接近完美的边缘屏障在较大的电流值下以涡流运动命令涡流运动。使用边缘控制的FFI模型描述了FFI的空间演化，这意味着沿样品边缘的FFI成核点链链，并将其发育成自组织的Josephson样结（Vortex Rivers）。此外，我们的结果还提供了有关广泛使用FFI模型的适用性的见解，并建议NB-C是快速单光子探测器的良好候选材料。
The ultra-fast dynamics of superconducting vortices harbors rich physics generic to nonequilibrium collective systems. The phenomenon of flux-flow instability (FFI), however, prevents its exploration and sets practical limits for the use of vortices in various applications. To suppress the FFI, a superconductor should exhibit a rarely achieved combination of properties: weak volume pinning, close-to-depairing critical current, and fast heat removal from heated electrons. Here, we demonstrate experimentally ultra-fast vortex motion at velocities of 10-15 km/s in a directly written Nb-C superconductor in which a close-to-perfect edge barrier orders the vortex motion at large current values. The spatial evolution of the FFI is described using the edge-controlled FFI model, implying a chain of FFI nucleation points along the sample edge and their development into self-organized Josephson-like junctions (vortex rivers). In addition, our results offer insights into the applicability of widely used FFI models and suggest Nb-C to be a good candidate material for fast single-photon detectors.
