Before revision: For a junction with identical superconductors on either side of the barrier, the critical current is related to the superconducting gap and the normal state resistance of the tunnel junction by the Ambegaokar-Baratoff formula (Ambegaokar-Baratoff formula) The Gor'kov phase evolution equation gives the rate of change of the phase (the velocity of the phase) as a linear function of the voltage as (Gor'kov-Josephson phase evolution equation) This equation is a generalization of the Schrödinger equation for the phase of the BCS wavefunction (see BCS theory) .
After revision: For a junction with identical superconductors on either side of the barrier, the critical current is related to the superconducting gap and the normal state resistance of the tunnel junction by the Ambegaokar-Baratoff formula (Ambegaokar-Baratoff formula) The Gor'kov phase evolution equation gives the rate of change of the phase (the "velocity" of the phase) as a linear function of the voltage as (Gor'kov-Josephson phase evolution equation) This equation is a generalization of the Schrödinger equation for the phase of the BCS wavefunction .