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Mesoscopic samples: the superconducting condensate via the Gross-Pitaevskii scenario

机译:介观样品:通过Gross-Pitaevskii场景的超导冷凝物

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Mesoscopic superconductors are routinely investigated with the Ginzburg-Landau equations, whereby the confinement is taken into account by imposing that the normal component of the superconducting current vanishes through the sample boundary. We argue that this approach gives misleading results when applied to micron- and submicron-sized devices, and we introduce modified Ginzburg-Landau equations that take the confinement potential into account on the level of the free energy functional. For devices much larger than the Ginzburg-Landau coherence length, both approaches agree, but deviations appear for samples of the scale of the coherence length. In the absence of a magnetic field, the modified Ginzburg-Landau equation for the order parameter reduces to the Gross-Pitaevskii equation.
机译:通常用Ginzburg-Landau方程研究介观超导体,从而通过强加超导电流的正态分量通过样品边界消失来考虑限制。我们认为,这种方法在应用于微米级和亚微米级的设备时会产生误导性的结果,并且我们引入了修正的Ginzburg-Landau方程,该方程考虑了自由能泛函水平的约束潜力。对于远大于Ginzburg-Landau相干长度的设备,这两种方法都可以达成共识,但对于相干长度尺度的样本会出现偏差。在没有磁场的情况下,用于阶数参数的改进的Ginzburg-Landau方程简化为Gross-Pitaevskii方程。

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