Dual-pathway symmetry breaking modulates bright-dark singlet exciton energy ordering in CSi(Ge)N monolayersRemoveJiansheng Tang, Huiwen Luo, Siwei Luo, Chao Tang, Zongyu Huang, Jianxin Zhong, and Gencai GuoPhys. Rev. B 114, 185417 (2026)
