Disentangling the effective single-particle gap in electron-doped cuprates: Electronic Raman absorption

In the under-to optimal-doping regimes of electron-doped cuprates, it was theoretically suspected that there is a coexistence of superconducting (SC) and antiferromagnetic (AFM) orders. The quasiparticle excitations could be gapped by both orders, and the effective gap is nonmonotonic d-wave-like in the momentum space. Alternatively, the gap was also speculated as a pure pairing gap. Using an effective microscopic model, we consider the manifestation of the quasiparticle gap in the electronic Raman spectra in a range of doping levels, where the relative strength of the SC and AFM order parameters varies. We demonstrate that from the electronic Raman spectra, the effective single-particle gap can be disentangled into contributions from the two distinctive orders. This would help to tell whether the nonmonotonic gap is due to the coexistence of SC and AFM orders.