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Superconducting 2D system with lifted spin degeneracy: Mixed singlet-triplet state

Lev P. Gor'kov·Emmanuel I. Rashba
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Abstract

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 two-fold 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.

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Lev P. Gor'kov, Emmanuel I. Rashba. 2001-03-21. Superconducting 2D system with lifted spin degeneracy: Mixed singlet-triplet state. https://doi.org/10.1103/physrevlett.87.037004

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