Josephson phase

In superconductivity, the Josephson phase is the difference of the phases of the quantum mechanical wave function in two superconducting electrodes forming a Josephson junction.

Example

If the macroscopic wave functions $\Psi_1$ and $\Psi_2$ in superconductors 1 and 2 are given by

$\Psi_j = \sqrt{n_s} \, e^{\mathrm{i} \, \theta_j},$

then the Josephson phase is defined by

$\phi\ \stackrel{\mathrm{def}}{=}\ \theta_2-\theta_1$ .

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