Effect of Dilute Magnetism in a Topological Insulator

Effect of Dilute Magnetism in a Topological Insulator

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Three-dimensional (3D) topological insulator (TI) has emerged as a unique state of quantum matter and generated enormous interests in condensed matter physics.The surfaces of a 3D TI consist of a massless Dirac cone, swuart which is characterized by the Z2 topological invariant.Introduction of magnetism on the surface of a TI is essential to realize the quantum anomalous Hall effect and other novel magneto-electric phenomena.

Here, by using a combination of first-principles calculations, magneto-transport and angle-resolved photoemission spectroscopy (ARPES), we study the electronic properties of gadolinium (Gd)-doped Sb2Te3.Our study shows that Gd doped Sb2Te3 is a spin-orbit-induced bulk band-gap material, whose surface is characterized by a single topological surface state.Our results provide a hot wheels octo car wash new platform to investigate the interactions between dilute magnetism and topology in magnetic doped topological materials.