Transport properties of AB-stacked bilayer graphene nanoribbons in an electric field

• Published in: The European physical journal. B, Condensed matter physics Vol. 64; no. 1; pp. 73 - 80
• Main Authors: Li, T. S., Huang, Y. C., Chang, S. C., Chuang, Y. C., Lin, M. F.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.07.2008; Springer; EDP sciences; Springer Nature B.V
• Subjects: Bilayers; Complex Systems; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electric field strength; Electric fields; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic structure of nanoscale materials : clusters, nanoparticles, nanotubes, and nanocrystals; Electronic transport in multilayers, nanoscale materials and structures; Energy gap; Exact sciences and technology; Fluid- and Aerodynamics; Graphene; Heat transfer; Interlayers; Nanoribbons; Physics; Physics and Astronomy; Solid State Physics; Thermal conductivity; Thermodynamic properties; Transport properties; 73.22.-f Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes and nanocrystals; 61.46.-w Structure of nanoscale materials; 73.23.-b Electronic transport in mesoscopic systems; Ultrathin films; Band structure; Stacking sequence; Dispersion relations; Nanotape; Subband; Thermal properties; Energy gap; Electronic structure; Graphene; Electric field effects; Transport processes; Curvature; Transverse field; Exchange interactions; Bilayers
• ISSN: 1434-6028; 1434-6036
• DOI: 10.1140/epjb/e2008-00282-x

The electronic and thermal properties of AB-stacked bilayer graphene nanoribbons subject to the influences of a transverse electric field are investigated theoretically, including their transport properties. The dispersion relations are found to exhibit a rich dependence on the interlayer interactions, the field strength, and the geometry of the layers. The interlayer coupling will modify the subband curvature, create additional band-edge states, change the subband spacing or energy gap, and separate the partial flat bands. The bandstructures will be symmetric or asymmetric about the Fermi energy for monolayer or bilayer nanoribbons, respectively. The inclusion of a transverse electric field will further alter the bandstructures and lift the degeneracy of the partial flat bands. The chemical-potential-dependent electrical and thermal conductance exhibit a stepwise increase behavior. Variations in the electronic structures with field strength will be reflected in the electrical and thermal conductance. Prominent peaks, as well as single-shoulder and multi-shoulder structures in the electrical and thermal conductance are predicted when varying the electric field strength. The features of the conductance are found to be strongly dependent on the field strength, the geometry, interlayer interactions and temperature.