Mode space approach for tight binding transport simulation in graphene nanoribbon FETs

Roberto Grassi, Antonio Gnudi, Elena Gnani, Susanna Reggiani, Giorgio Baccarani

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16 Scopus citations


A mode space (MS) tight binding approach for the simulation of armchair graphene nanoribbon FETs is discussed. It makes use of slab-dependent modes and a novel criterion for mode selection, going beyond the one based on the lowest energy subbands. For ideal ribbons, we show that by splitting the modes into decoupled groups, the new method provides results almost identical to the real space (RS) with a speedup of more than one order of magnitude. Even in the presence of edge roughness, which tends to couple the modes, the MS approach still offers a sizable computational advantage with respect to the RS, while retaining a good accuracy.

Original languageEnglish (US)
Article number5373922
Pages (from-to)371-378
Number of pages8
JournalIEEE Transactions on Nanotechnology
Issue number3
StatePublished - May 2011

Bibliographical note

Funding Information:
Manuscript received July 22, 2009; accepted November 23, 2009. Date of publication January 8, 2010; date of current version May 11, 2011. This work was supported by the EU FP7 IST project GRAND under contract 215752 via the IU.NET Consortium. The review of this paper was arranged by Associate Editor J.-P. Leburton.


  • Graphene nanoribbon (GNR) FETs
  • mode-space (MS) approach
  • nonequilibrium Greens functions (NEGF)
  • tight binding (TB) Hamiltonian


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