“…Recently, more and more ferrovalley materials have been discovered, such as H-VSe 2 , [15,16] H-LaBr 2 , [17] H-GdI 2 , [18] H-FeCl 2 , [19,20] Nb 3 I 8 , [21] MN 2 H 2 [22] and VSi 2 N 4 [23,24] and their Janus structures, [9,[25][26][27][28][29][30][31] in which not only the spatial inversion symmetry but also the time reversal symmetry is broken. Ferrovalley materials are promising materials for spintronic and valleytronic devices, but the optical properties of ferrovalley materials in terms of exciton effects have yet to be studied.…”