sd2 Graphene: Kagome Band in Hexagonal lattice

Abstract

Graphene, made of sp2 hybridized carbon, is characterized with a Dirac band, representative of its underlying 2D hexagonal lattice. Fundamental understanding of graphene has recently spurred a surge of searching for 2D topological quantum phases in solid-state materials. Here, we propose a new form of 2D material, consisting of sd2 hybridized transition metal atoms in hexagonal lattice, called sd2 graphene. The sd2 graphene is characterized with bond-centered electronic hopping, which transforms the apparent atomic hexagonal lattice into the physics of kagome lattice that may exhibit a wide range of topological quantum phases. Based on first-principles calculations, room temperature quantum anomalous Hall states with an energy gap of 0.1 eV are demonstrated for one such lattice made of W, which can be epitaxially grown on a semiconductor surface of 1/3 monolayer Cl-covered Si(111), with high thermodynamic and kinetic stability.

Phys. Rev. Lett.(2014), In press. It includes main text and 5 figures. Supplemental material is available upon request

References in corpus (9)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• High temperature fractional quantum Hall states
• Nearly-flat bands with nontrivial topology
• Anisotropic behaviors of massless Dirac fermions in graphene under periodic potential
• Unconventional Fermi surface instabilities in the Kagome Hubbard Model
• Epitaxial growth of large-gap quantum spin Hall insulator on semiconductor surface
• Interaction-driven topological insulators on the kagome and the decorated honeycomb lattices

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• Sumanene monolayer of pure carbon: a two-dimensional Kagome-analogy lattice with desirable band gap, ultrahigh carrier mobility and strong exciton binding energy
• Prediction of Topological Crystalline Insulator and Topological Phase Transitions in Two-dimensional PbTe Films
• Self- texturizing electronic-properties in a 2-dimensional GdAu2 layer on Au(111): the role of out-of-plane atomic displacement
• Realization of a transition between type-I and type-II Dirac semimetals in monolayers
• Bilayer twisting as a mean to isolate connected flat bands in a Kagome lattice through Wigner crystallization