论文标题
kramers fulde-ferrell状态和超导旋转二极管效应
Kramers Fulde-Ferrell state and superconducting spin diode effect
论文作者
论文摘要
我们研究了一个新型的Fulde-Ferrell等自旋配对状态，每个自旋极化都具有相对的群众库珀配对动量。该状态尊重时反转对称性，并被称为Kramers Fulde-Ferrell（KFF）状态。它可以在具有自旋轨道耦合和最近的邻居吸引力的一维系统中实现。我们发现，当倒置对称性破裂时，KFF状态支持散装超导体和约瑟夫森连接的非偏置自旋转运。除了自旋约瑟夫森二极管效应外，电荷运输还通过界面状态的动力学来控制，这些状态可以通过KFF超导体的长度来操纵其过渡。我们讨论了有效理论与沿线缺陷和域壁上的单层Fe基超导体观察到的新物理学的相关性，以及使用旋转使无耗散超导旋转旋转的潜力。
We study a novel Fulde-Ferrell equal-spin pairing state with opposite center of mass Cooper pair momentum for each spin polarization. This state respects time-reversal symmetry and is dubbed a Kramers Fulde-Ferrell (KFF) state. It can be realized in a one-dimensional system with spin-orbit coupling and nearest neighbor attraction. We find that the KFF state supports nonreciprocal spin transport for both bulk superconductor and Josephson junctions when inversion symmetry is broken. In addition to the spin Josephson diode effect, the charge transport is controlled by intriguing dynamics of bound states whose transitions can be manipulated by the length of the KFF superconductor. We discuss the relevance of the effective theory to the novel physics observed in monolayer Fe-based superconductor along line defects and domain walls, and the potential for using spins to make dissipationless superconducting spintronics.
