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We present a density functional theory (DFT) based study of a two-dimensionalphase of chromium bismuthate (CrBi), previously unknown material withexceptional magnetic and magnetooptical characteristics. Monolayer CrBi is aferromagnetic metal with strong spin-orbit coupling induced by the heavybismuth atoms, resulting in a strongly anisotropic Ising-type magnetic orderingwith the Curie temperature estimated to be higher than 300 K. The electronicstructure of the system is topologically nontrivial, giving rise to a nonzeroBerry curvature in the ground magnetic state, leading to the anomalous Halleffect with the conductivity plateau of $\sim$1.5 $e^2/h$ at the Fermi level.Remarkably, the Hall conductivity and the magnetooptical constant are found tobe strongly dependent on the direction of magnetization. Besides, monolayerCrBi demonstrates the polar magnetooptical Kerr effect in the visible andnear-ultraviolet spectral ranges with the maximum rotation angles of up to 10mrad. Our findinds suggest that monolayer CrBi is a promising system forpractical applications in magnetooptical and spintronic devices.

Two-dimensional chromium bismuthate: A room-temperature Ising ferromagnet with tunable magneto-optical response