124 research outputs found
Transmittance through Random Media
We present a tractable and stable technique for numerical determination of transmittance and conductance through random media. The methodology is numerically stable for large systems and capable of being generalised for higher dimensions. We illustrate the technique by two specific applications
Effect of disorder on the electronic properties of graphene: a theoretical approach
In order to manipulate the properties of graphene, its very important to
understand the electronic structure in presence of disorder. We investigate,
within a tight-binding description, the effects of disorder in the on-site
(diagonal disorder) term in the Hamiltonian as well as in the hopping integral
(off-diagonal disorder) on the electronic dispersion and density of states by
augmented space recursion method. Extrinsic off-diagonal disorder is shown to
have dramatic effects on the two-dimensional Dirac-cone, including asymmetries
in the band structures as well as the presence of discontinuous bands in
certain limits. Disorder-induced broadening, related to the scattering length
(or life-time) of electrons, is modified significantly with the increasing
strength of disorder. We propose that our theory is suitable to study the
effects of disorder in other 2D materials, e.g., a boron nitride monolayer.Comment: 11 pages, 8 figure
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