Superconducting 2D System with Lifted Spin Degeneracy: Mixed Singlet-Triplet State
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 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.
- Publication:
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Physical Review Letters
- Pub Date:
- July 2001
- DOI:
- 10.1103/PhysRevLett.87.037004
- arXiv:
- arXiv:cond-mat/0103449
- Bibcode:
- 2001PhRvL..87c7004G
- Keywords:
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- Condensed Matter - Superconductivity
- E-Print:
- 5 pages, no figures