Before revision: Existence of interface Dirac states in HgTe/CdTe was experimentally verified by Lauren W. Molenkamp's group in 2D topological insulators in 2007.
After revision: Existence of interface Dirac states in HgTe/CdTe was experimentally verified by Laurens W. Molenkamp's group in 2D topological insulators in 2007.