51 research outputs found
Disorder and Electronic Transport in Graphene
In this review, we provide an account of the recent progress in understanding
electronic transport in disordered graphene systems. Starting from a
theoretical description that emphasizes the role played by band structure
properties and lattice symmetries, we describe the nature of disorder in these
systems and its relation to transport properties. While the focus is primarily
on theoretical and conceptual aspects, connections to experiments are also
included. Issues such as short versus long-range disorder, localization (strong
and weak), the carrier density dependence of the conductivity, and conductance
fluctuations are considered and some open problems are pointed out.Comment: 18 pages, 5 figures, Topical Revie
The recursive Green's function method for graphene
We describe how to apply the recursive Green's function method to the
computation of electronic transport properties of graphene sheets and
nanoribbons in the linear response regime. This method allows for an amenable
inclusion of several disorder mechanisms at the microscopic level, as well as
inhomogeneous gating, finite temperature, and, to some extend, dephasing. We
present algorithms for computing the conductance, density of states, and
current densities for armchair and zigzag atomic edge alignments. Several
numerical results are presented to illustrate the usefulness of the method.Comment: 26 pages, 15 figures; submitted to Journal of Computational
Electronics (special issue on graphene
Multi-scale approach for strain-engineering of phosphorene
A multi-scale approach for the theoretical description of deformed
phosphorene is presented. This approach combines a valence-force model to
relate macroscopic strain to microscopic displacements of atoms and a
tight-binding model with distance-dependent hopping parameters to obtain
electronic properties. The resulting self-consistent electromechanical model is
suitable for large-scale modeling of phosphorene devices. We demonstrate this
for the case of an inhomogeneously deformed phosphorene drum, which may be used
as an exciton funnel
- …