We show that the magnetic response of atomically thin materials with Dirac spectrum and spin-orbit interactions can exhibit strong dependence on electron-electron interactions. While graphene itself has a very small spin-orbit coupling, various two-dimensional (2D) compounds "beyond graphene" are good candidates to exhibit the strong interplay between spin-orbit and Coulomb interactions. Materials in this class include dichalcogenides (such as MoS2 and WSe2), silicene, germanene, as well as 2D topological insulators described by the Kane-Mele model. We present a unified theory for their in-plane magnetic field response leading to "anomalous", i.e. electron interaction dependent transition moments. Our predictions can be potentially used to construct unique magnetic probes with high sensitivity to electron correlations.
@article{arxiv.1912.02749,
title = {Anomalous Transition Magnetic Moments in two-dimensional Dirac Materials},
author = {Sanghita Sengupta and Madalina I. Furis and Oleg P. Sushkov and Valeri N. Kotov},
journal= {arXiv preprint arXiv:1912.02749},
year = {2020}
}