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Spectral footprints of impurity scattering in graphene nanoribbons

Anders Bergvall (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Tomas Löfwander (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik)
Physical Review B. Condensed Matter and Materials Physics (1098-0121). Vol. 87 (2013), 20,
[Artikel, refereegranskad vetenskaplig]

We report a detailed investigation of the interplay between size quantization and local scattering centers in graphene nanoribbons, as seen in the local density of states. The spectral signatures, obtained after Fourier transformation of the local density of states, include characteristic peaks that can be related to the transverse modes of the nanoribbon. In armchair ribbons, the Fourier transformed density of states of one of the two inequivalent sublattices takes a form similar to that of a quantum channel in a two-dimensional electron gas, modified according to the differences in band structure. After addition of the second sublattice contribution, a characteristic modulation of the pattern due to superposition is obtained, similar to what has been obtained in spectra due to single impurity scattering in large-area graphene. We present analytic results for the electron propagator in armchair nanoribbons in the Dirac approximation, including a single scattering center within a T-matrix formulation. For comparison, we have extended the investigation with numerics obtained with an atomistic recursive Green's function approach. The spectral signatures of the atomistic approach include the effects of trigonal warping. The impurity induced oscillations in the local density of states are not decaying at large distance in few-mode nanoribbons.

Denna post skapades 2013-07-08. Senast ändrad 2013-07-10.
CPL Pubid: 179923


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik


Den kondenserade materiens fysik

Chalmers infrastruktur

Relaterade publikationer

Denna publikation ingår i:

Quantum Transport Theory in Graphene



Denna publikation är ett resultat av följande projekt:

New Electronics Concept: Wafer-Scale Epitaxial Graphene (CONCEPTGRAPHENE) (EC/FP7/257829)