超导带材中的超导体-绝缘体磁振荡
Superconductor-Insulator Magneto-Oscillations in Superconducting Strips
摘要：
超导薄带在垂直磁场B和低温T作用下的磁阻效应表现为一系列交替的超导体-绝缘体转变（SIT）。我们研究这种现象在一个准一维（1D）模型的量子动力学的涡旋耦合平行SC线之间的线结，在接近其SIT的参数。将涡旋系统映射到化学势为B的一维费米子上，发现在涡旋填充的临界值处发生伊辛型的量子相变，从接近整数填充的SC相到接近1/2填充的绝缘体.对于T->0，所得到的磁阻R（B）表现出与实验观察类似的振荡。
英文摘要：
The magnetoresistance of thin superconducting strips subject to a perpendicular magnetic field B and low temperatures T manifests a sequence of alternating superconductor-insulator transitions (SIT). We study this phenomenon within a quasi one-dimensional (1D) model for the quantum dynamics of vortices in a line-junction between coupled parallel SC wires, at parameters close to their SIT. Mapping the vortex system to 1D Fermions at a chemical potential dictated by B, we find that a quantum phase transition of the Ising type occurs at critical values of the vortex filling, from a SC phase near integer filling to an insulator near 1/2-filling. For T->0, the resulting magnetoresistance R(B) exhibits oscillations similar to the experimental observation.
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