Phase diagram of a surface superconductor in parallel magnetic field

The universal phase diagram of a 2D surface superconductor with generic Rashba interaction in a parallel magnetic field is found. In addition to the uniform BCS state, we find two inhomogeneous superconductive states, the stripe phase with Delta(r) proportional to cos(Qr) at high magnetic fields, and a new "helical" phase with Delta(r) proportional to exp(iQr) which intervenes between the BCS state and stripe phase at an intermediate magnetic field and temperature. We prove that the ground state for helical phase carries no current. (C) 2003 MAIK "Nauka/Interperiodica".