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arXiv 2009.01165cond-mat.supr-con
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超导纳米线中拓扑控制的相位相干性和量子涨落

Topology controlled phase coherence and quantum fluctuations in superconducting nanowires

Alexey Radkevich, Andrew G. Semenov, Andrei D. Zaikin

摘要:

金属纳米线的超导性质可能强烈地依赖于特定的实验条件。在这里,我们考虑的设置超导相位波动被限制在一个点内的导线和平衡超导电流沿导线段的任意长度$L$。这种结构的低温物理性质基本上一方面由平滑的相位起伏决定,另一方面由量子相位滑移决定。零温相图由导线截面控制,由一个真正的超导相和两个不同的相组成,其中超导性只能在较短的长度尺度上观察到。后者的阶段之一表现出更强大的短尺度超导性,而另一个演示了幂律衰减的超导电流增加$L$已经在相对较短的尺度。

英文摘要:

Superconducting properties of metallic nano-wires may strongly depend on specific experimental conditions. Here we consider a setup where superconducting phase fluctuations are restricted at one point inside the wire and equilibrium supercurrent flows along the wire segment of an arbitrary length $L$. Low temperature physics of this structure is essentially determined, on one hand, by smooth phase fluctuations and, on the other hand, by quantum phase slips. The zero temperature phase diagram is controlled by the wire cross section and consists of a truly superconducting phase and two different phases where superconductivity can be observed only at shorter length scales. One of the latter phases exhibits more robust short-scale superconductivity whereas another one demonstrates a power-law decay of the supercurrent with increasing $L$ already at relatively short scales.

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