Revised symmetry rule and intrinsically time-reversal symmetry breaking pairing in multi-orbital superconductors
We investigate the basic symmetry rule for the particle permutation in superconducting (SC) pairing states by examining the numerical solution of the linearized Eliashberg equation for Sr$_2$RuO$_4$. We find that the general multi-band, frequency-dependent SC gap function does not simply transform to itself up to the m...