Magnetic Impurities on the Surface of a Topological Insulator
Magnetic Impurities on the Surface of a Topological Insulator
The surface states of a topological insulator are described by an emergent relativistic massless Dirac equation in 2 + 1 dimensions. In contrast with graphene, there is an odd number of Dirac points, and the electron spin is directly coupled to the momentum. We show that a magnetic impurity opens …