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Superconductivity in engineered two-dimensional electron gases
Physical Review B ( IF 3.7 ) Pub Date : 2017-11-17 00:00:00 , DOI: 10.1103/physrevb.96.174514
Andrey V. Chubukov , Steven A. Kivelson

We consider Kohn-Luttinger mechanism for superconductivity in a two-dimensional electron gas confined to a narrow well between two grounded metallic planes with two occupied subbands with Fermi momenta kFL>kFS. On the basis of a perturbative analysis, we conclude that non-s-wave superconductivity emerges even when the bands are parabolic. We analyze the conditions that maximize Tc as a function of the distance to the metallic planes, the ratio kFL/kFS, and rs, which measures the strength of Coulomb correlations. The largest attraction is in p-wave and d-wave channels, of which p wave is typically the strongest. For rs=O(1) we estimate that the dimensionless coupling λ101, but it likely continues increasing for larger rs (where we lose theoretical control).

中文翻译:

工程二维电子气中的超导性

我们考虑了二维电子气中的超导性的Kohn-Luttinger机理,该二维电子气被限制在两个接地金属平面之间的狭窄阱中,该平面具有两个费米动量所占据的子带。 ķF大号>ķF小号。在微扰分析的基础上,我们得出以下结论:s即使带是抛物线形的,波超导也会出现。我们分析最大化的条件ŤC 作为到金属平面的距离的函数,该比率 ķF大号/ķF小号, 和 [Rs,它测量库仑相关性的强度。最大的吸引力是p波和 d频道,其中 p波浪通常是最强的。为了[Rs=Ø1个 我们估计无量纲耦合 λ10-1个,但较大的情况可能会继续增加 [Rs (我们失去了理论控制权)。
更新日期:2017-11-17
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