Two-dimensional MX family of Dirac materials and quantum spin Hall insulators with tunable electronic and topological properties
ORAL
Abstract
A novel class of two dimensional MX (M=Be, Mg, Zn and Cd, X = Cl, Br and I) compounds with an unbalanced chemical formula was proposed by using data-driven method and first-principle calculations, exhibiting Dirac states with ultra-high Fermi velocities emerged from the interplay of incomplete charge transfer and hexagonal bipartite lattice. Intrinsically being time-reversal-invariant topological insulators when considering spin-orbital coupling, some members of this family offer exciting opportunities to host superconductivity in a highly tunable topological matrix. The electronic and topological properties are found to be highly tunable and amenable to modulation via anion-layer substitution and vertical electric field. The presence of sizable spin-orbital-coupling band gaps, ultra-high carrier mobilities, and small effective masses makes the MX family promising for electronics and spintronics applications.
*Project supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, the National Key Research and Development Projects of China, Strategic Priority Research Program, National Natural Science Foundation of China, and the International Partnership Program of the Chinese Academy of Sciences.
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Presenters
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Yan-Fang Zhang
- Chinese Academy of Sciences,Institute of Physics