▎ 摘　　要

NOVELTY - The graphene-based composite structure (10) comprises a graphene layer (12), a transition metal layer (14) and a substrate (16). The graphene layer, the transition metal layer, and the substrate are stacked together in series. The graphene layer and the transition metal layer are coupled by hybridization of d orbitals of transition metal atoms in the transition metal layer and p orbitals of carbon atoms in the graphene layer. The transition metal layer and the substrate are coupled by hybridization of d orbitals of transition metal atoms in the transition metal layer. USE - The graphene-based composite structure is useful as a topological insulator (claimed), and in electronic devices and semiconductor device such as thin film transistor, integrated circuit, sensor and other nano-scale devices. ADVANTAGE - The graphene-based composite structure preserves Dirac cone structure thus exhibiting strong interaction between the graphene and substrate, and has excellent carrier mobility and thermal and mechanical stabilities. DETAILED DESCRIPTION - The graphene-based composite structure (10) comprises a graphene layer (12), a transition metal layer (14), and a substrate (16). The graphene layer, the transition metal layer and the substrate are stacked together in series. The graphene layer and the transition metal layer are coupled by hybridization of d-orbitals of transition metal atoms in the transition metal layer and p-orbitals of carbon atoms in the graphene layer. The transition metal layer and the substrate are coupled by hybridization of d-orbitals of transition metal atoms in the transition metal layer and p orbitals of silicon atoms in the substrate. The graphene layer is a single-layer graphene. The transition metal layer is a one-atom-thick transition metal layer. A binding energy between the graphene layer and a composite structure of the transition metal layer and the substrate is 0.51 eV/C. A band structure of the graphene-based composite structure is a Dirac cone. A spin-orbit gap in the band structure is 100 meV. DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a graphene-based composite structure. Graphene-based composite structure (10) Graphene layer (12) Transition metal layer (14) Substrate. (16)