Quantum transport in magnetic two-dimensional materials

The advent of two-dimensional (2D) materials provides new opportunities at the frontier of material research. Our recent development of fabrication and doping techniques enables us to probe the quantum transport in novel 2D materials. In this talk, I will focus on two magnetic 2D materials, ferromagnetic metal Fe₃GeTe₂ and intrinsic magnetic topological insulator MnBi₂Te₄. In Fe₃GeTe₂, we observed intrinsic ferromagnetism in the 2D limit and demonstrated tunable room-temperature ferromagnetism by an ionic gate. In few-layer MnBi₂Te₄, we observed the quantum anomalous Hall effect together with the conventional quantum Hall effect.