Article (Scientific journals)
Theoretical study of scattering in graphene ribbons in the presence of structural and atomistic edge roughness
Moors, Kristof; Contino, Antonino; Van de Put, Maarten L. et al.
2019In Physical Review Materials, 3 (2), p. 024001
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Abstract :
[en] We investigate the diffusive electron-transport properties of charge-doped graphene ribbons and nanoribbons with imperfect edges. We consider different regimes of edge scattering, ranging from wide graphene ribbons with (partially) diffusive edge scattering to ribbons with large width variations and nanoribbons with atomistic edge roughness. For the latter, we introduce an approach based on pseudopotentials, allowing for an atomistic treatment of the band structure and the scattering potential, on the self-consistent solution of the Boltzmann transport equation within the relaxation-time approximation and taking into account the edge-roughness properties and statistics. The resulting resistivity depends strongly on the ribbon orientation, with zigzag (armchair) ribbons showing the smallest (largest) resistivity and intermediate ribbon orientations exhibiting intermediate resistivity values. The results also show clear resistivity peaks, corresponding to peaks in the density of states due to the confinement-induced subband quantization, except for armchair-edge ribbons that show a very strong width dependence because of their claromatic behavior. Furthermore, we identify a strong interplay between the relative position of the two valleys of graphene along the transport direction, the correlation profile of the atomistic edge roughness, and the chiral valley modes, leading to a peculiar strongly suppressed resistivity regime, most pronounced for the zigzag orientation.
Disciplines :
Physics
Author, co-author :
Moors, Kristof ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Contino, Antonino
Van de Put, Maarten L.
Vandenberghe, William G.
Fischetti, Massimo V.
Magnus, Wim
Sorée, Bart
External co-authors :
yes
Language :
English
Title :
Theoretical study of scattering in graphene ribbons in the presence of structural and atomistic edge roughness
Publication date :
06 February 2019
Journal title :
Physical Review Materials
ISSN :
2475-9953
Publisher :
American Physical Society
Volume :
3
Issue :
2
Pages :
024001
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
Available on ORBilu :
since 07 February 2019

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