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.

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

References in corpus (16)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Quantum Spin Hall Effect in Graphene
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• High temperature fractional quantum Hall states
• Nearly-flat bands with nontrivial topology
• Chiral superconductivity from repulsive interactions in doped graphene
• Anisotropic behaviors of massless Dirac fermions in graphene under periodic potential
• Unconventional Fermi surface instabilities in the Kagome Hubbard Model
• Quantum Anomalous Hall Effect in 2D Organic Topological Insulators
• Electrically tunable quantum anomalous Hall effect in 5d transition-metal adatoms on graphene
• Epitaxial growth of large-gap quantum spin Hall insulator on semiconductor surface
• Interaction-driven topological insulators on the kagome and the decorated honeycomb lattices
• Formation of quantum spin Hall state on Si surface and energy gap scaling with strength of spin orbit coupling

Cited by in corpus (32)

• Topological Phases in Two-Dimensional Materials: A Brief Review
• $\Gamma$-Valley Transition-Metal-Dichalcogenide Moirè Bands
• Prediction of High Temperature Quantum Anomalous Hall Effect in Two Dimensional Transition-Metal Oxides
• Screening 2D materials with topological flat bands
• Quantum anomalous Hall effect in stable 1T-YN${}_2$ monolayer with a large nontrivial band gap and high Chern number
• Formation of Ideal Rashba States on Layered Semiconductor Surfaces Steered by Strain Engineering
• Double Kagome bands in a two-dimensional phosphorus carbide P2C3
• Orbital Design of Flat Bands in Non-Line-Graph Lattices via Line-Graph Wavefunctions
• Large Band Gap Quantum Anomalous Hall Phase in Hexagonal Organometallic Frameworks
• Hidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO${}_2$
• Flat Band and Hole-induced Ferromagnetism in a Novel Carbon Monolayer
• Hidden Breathing Kagome Topology in Hexagonal Transition Metal Dichalcogenides
• Tuning the topological states in metal-organic bilayers
• Magnetic Dirac Fermions and Chern Insulator Supported on Pristine Silicon Surface
• Antiferromagnetism, $f$-wave and chiral $p$-wave superconductivity in a Kagome lattice with possible application to $s{d}^2$-graphenes
• Tuning ferromagnetic BaFe${}_2$(PO${}_4$)${}_2$ through a high Chern number topological phase
• Magnetic moiré surface states and flat chern band in topological insulators
• Large orbital moment and spin-orbit enabled Mott transition in the Ising Fe honeycomb lattice BaFe2(PO4)2
• Sumanene monolayer of pure carbon: a two-dimensional Kagome-analogy lattice with desirable band gap, ultrahigh carrier mobility and strong exciton binding energy
• Confinement-driven electronic and topological phases in corundum-derived $3d$-oxide honeycomb lattices
• 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
• Chern insulating phases and thermoelectric properties of EuO/MgO(001) superlattices
• Thermal Hall Conductivity in Superconducting Phase on Kagome Lattice
• Realization of a transition between type-I and type-II Dirac semimetals in monolayers
• Realizing robust large-gap quantum spin Hall state in 2D HgTe monolayer on insulating substrate
• Isolated nearly flat higher Chern band in monolayer transition metal trihalides
• Bilayer twisting as a mean to isolate connected flat bands in a Kagome lattice through Wigner crystallization
• Spin-biased quantum spin Hall effect in altermagnetic Lieb lattice
• Interaction-driven spin-orbit effects and Chern insulating phases in corundum-based $4d$ and $5d$ oxide honeycomb lattices
• Design of Chern Insulating Phases in Honeycomb Lattices
• Symmetry-Based Real-Space Framework for Realizing Flat Bands and Unveiling Nodal-Line Touchings