Optical Response of Magnetic van der Waals Heterostructures*

There is a growing class of atomically thin van der Waals materials with striking optical properties, which, unlike their bulk counterparts, can be highly tunable and have strong Coulomb interactions. Excitonic features in van der Waals materials provide fingerprints for proximitized materials, for example, modified by magnetism, tunable band topology, charge density waves, Rashba SOC or trigonal warping [1-5]. While the role of Rashba SOC and trigonal warping for atomic monolayers is now recognized [5], studying the combined role of Coulomb interaction, magnetism, and various other modifications from a substrate is still missing. We study optical absorption by carefully solving the Bethe-Salpeter equation based on more accurate Hamiltonians and discuss how they can be observed experimentally.

[1] G. Xu et al., Phys. Rev. Lett. 119, 127403 (2017)

[2] G. Xu et al., Phys. Rev. Lett. 125, 157402 (2020)

[3] J. Joshi et al., APL Mater. 10, 011103 (2022)

[4] I. Zutic et al., Mater. Today 22, 85 (2019)

[5] J. D. Cao et al., Preprint (2023)