3D quantum Hall effect: Theories and recent progress

The quantum Hall effect is one of the most important discoveries in condensed matter physics. Usually, the quantum Hall effect happens in 2D. A 3D quantum Hall effect has been a long-sought phase of matter. Recently, the quantized Hall resistance has been observed 3D crystals of Cd3As2 and ZrTe5 and can be attributed to the Weyl orbit and charge density wave mechanisms, respectively. In this talk, we will introduce the theories and recent progress of 3D quantum Hall effect.