论文标题
超导双层中的层间相干性
Interlayer coherence in Superconductor Bilayers
论文作者
论文摘要
我们研究了电分离的超导双层体中层相干性的可能性和意义。我们发现，如果层之间的排斥性相互作用足够强，则在平均近似近似值中，双层可以同时具有超导和激子顺序。激子顺序意味着层间相位的相干性，可以在对称和反对称双层状态的表示中进行研究。当两个阶都存在时，我们发现具有对称和反对称状态对幅度不同值的平均场方程的几种解。尽管排斥的层相互作用，混合状态必须具有不同层的电子的非零对振幅，并且这些层是造成空间间接的Andreeve反射过程，其中一层输入电子可以作为相对层的孔反射为一个层中的电子。我们评估层对角线和非对角线电流 - 可用于实验识别该状态的关系。
We investigate the possibility and implications of interlayer coherence in electrically isolated superconducting bilayers. We find that in a mean-field approximation bilayers can have superconducting and excitonic order simultaneously if repulsive interactions between layers are sufficiently strong. The excitonic order implies interlayer phase coherence, and can be studied in a representation of symmetric and antisymmetric bilayer states. When both orders are present we find several solutions of the mean-field equations with different values of the the symmetric and antisymmetric state pair amplitudes. The mixed state necessarily has non-zero pair amplitudes for electrons in different layers in spite of the repulsive interlayer interactions, and these are responsible for spatially indirect Andreev reflection processes in which an incoming electron in one layer can be reflected as a hole in the opposite layer. We evaluate layer diagonal and off-diagonal current-voltage relationships that can be used to identify this state experimentally.
