Discovery of several large families of Topological Insulator classes with backscattering-suppressed spin-polarized single-Dirac-cone on the surface

Abstract

Three dimensional (3D) topological insulators are novel states of quantum matter that feature spin-momentum locked helical Dirac fermions on their surfaces and hold promise to open new vistas in spintronics, quantum computing and fundamental physics. Experimental realization of many of the predicted topological phenomena requires finding multi-variant topological band insulators which can be multiply connected to magnetic semiconductors and superconductors. Here we present our theoretical prediction and experimental discovery of several new topological insulator classes in AB2X4(124), A2B2X5(225), MN4X7(147), A2X2X'(221) [A,B=Pb,Ge,Sb,Bi and M,N=Pb,Bi and X,X'=Chalcogen family]. We observe that these materials feature gaps up to about 0.35eV. Multi-variant nature allows for diverse surface dispersion tunability, Fermi surface spin-vortex or textured configurations and spin-dependent electronic interference signaling novel quantum transport processes on the surfaces of these materials. Our discovery also provides several new platforms to search for topological-superconductivity (arXiv:0912.3341v1 (2009)) in these exotic materials.

arXiv comment11 pages, 4 Figures

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• Colloquium: Topological Band Theory
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• Rapid Surface Oxidation as a Source of Surface Degradation Factor for Bi2Se3
• Materials Cartography: Representing and Mining Material Space Using Structural and Electronic Fingerprints
• Unexpected mass acquisition of Dirac fermions at the quantum phase transition of a topological insulator
• Sn-doped Bi1.1Sb0.9Te2S, a bulk topological insulator with ideal properties
• Ternary Tetradymite Compounds as Topological Insulators
• Direct observation of Landau level resonance and mass generation in Dirac semimetal Cd3As2 thin films
• Unusual magnetic phases in the strong interaction limit of two-dimensional topological band insulators in transition metal oxides
• Two-dimensional magnetotransport in Bi2Te2Se nanoplatelets
• Topological metal behavior in GeBi2Te4 single crystals
• Self-consistent study of Abelian and non-Abelian order in a two-dimensional topological superconductor
• A study on the surface states of a topological insulator: Bi2Se3
• Machine learning, phase stability, and disorder with the Automatic Flow Framework for Materials Discovery