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Phys Rev Lett. 2001 Jul 16;87(3):037004. Epub 2001 Jul 2.

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

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National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.


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.

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