Large exciton binding energies in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>MnPS</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> as a case study of a van der Waals layered magnet

Stable excitons in semiconductor monolayers such as transition-metal dichalcogenides (TMDCs) enable and motivate fundamental research well the development of room-temperature optoelectronics applications. The newly discovered layered magnetic materials present a unique opportunity to integrate optical functionalities with magnetism. We predict that large class antiferromagnetic semiconducting $M\mathrm{P}X{}_{3}$ family exhibit giant excitonic binding energies, making them suitable platforms for magneto-optical investigations optospintronics Indeed, our investigations, based on first-principles methods combined an effective-model Bethe-Salpeter solver, show bare Neel-${\mathrm{MnPS}}_{3}$ are bound by more than 1 eV, which is twice energies TMDCs. In addition, ordering monolayer samples can be inferred indirectly using different polarization light.