Quantum Hall Effect in a Three-Dimensional Topological Insulator

The work by Chen et. al. explores the quantum hall effect (QHE) that develops in BiSbTeSe₂ at low temperatures and high magnetic fields. BiSbTeSe₂ is a topological insulator, meaning it is a bulk insulating material that at low temperatures develops a quantum mechanical state that allows conduction of electrons at the surface similar to a metal. The observation of the QHE in BiSbTeSe₂ is further confirmation of the theory governing these unique materials.