Fig. 2.

Energy spectra of superconductors with SOC: (A) conventional superconductor without external field and external current, (B) helical superconductor with external field without external current, and (C and D) helical superconductor with external field and external current along opposite directions. We use Eqs. 1 and 4 with $m=1,\mu =10,{\alpha }_{\text{R}}=1,\mathit{B}=B\widehat{\mathit{y}},\mathit{J}=J\widehat{\mathit{x}}$ and pairing potential Δ = 3. In B–D, $B=0.6\ll {\mathrm{\Delta }}_{so}=2\sqrt{5}$.