Superconducting 2D System with Lifted Spin Degeneracy: Mixed Singlet-Triplet State

Lev P. Gor'kov; Emmanuel I. Rashba

doi:10.1103/PhysRevLett.87.037004

Superconducting 2D System with Lifted Spin Degeneracy: Mixed Singlet-Triplet State

Lev P. Gor'kov and Emmanuel I. Rashba

Phys. Rev. Lett. 87, 037004 – Published 2 July 2001

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 $T = 0$ .

Received 20 March 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.037004

Authors & Affiliations

Lev P. Gor'kov^*

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

Emmanuel I. Rashba^†

Department of Physics, The State University of New York at Buffalo, Buffalo, New York 14260

^*Also at L. D. Landau Institute for Theoretical Physics, Russian Academy of Sciences, 117334 Moscow, Russia.
^†Also at Department of Physics, MIT, Cambridge, MA 02139.Email address: erashba@mailaps.org.