Gor'kov L P, Rashba E I
National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
Phys Rev Lett. 2001 Jul 16;87(3):037004. doi: 10.1103/PhysRevLett.87.037004. Epub 2001 Jul 2.
Motivated by recent experimental findings, we have developed a theory of the superconducting state for 2D metals without inversion symmetry modeling the geometry of a surface superconducting layer in a field-effect transistor or near the boundary doped by adsorbed ions. In such systems the twofold spin degeneracy is lifted by spin-orbit interaction, and singlet and triplet pairings are mixed in the wave function of the Cooper pairs. As a result, spin magnetic susceptibility becomes anisotropic and Knight shift retains finite and rather high value at T = 0.
受近期实验结果的启发，我们针对无空间反演对称性的二维金属超导态建立了一种理论，该理论对场效应晶体管中表面超导层的几何结构或由吸附离子掺杂的边界附近的几何结构进行了建模。在这类系统中，自旋轨道相互作用消除了双重自旋简并性，并且在库珀对的波函数中，单重态和三重态配对相互混合。结果，自旋磁化率变得各向异性，并且在T = 0时奈特位移保持有限且相当高的值。
