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• W2016005113 abstract "In this paper, we present a mode space method for atomistic non-equilibrium Green's function simulations of armchair graphene nanoribbon field effect transistors (FETs) that includes electron-phonon scattering. With reference to both conventional and tunnel FET structures, we show that, in the ideal case of a smooth electrostatic potential, the modes can be decoupled in different groups without any loss of accuracy. Thus, inter-subband scattering due to electron-phonon interactions is properly accounted for, while the overall simulation time considerably improves with respect to real-space, with a speed-up factor of 40 for a 1.5-nm-wide device. Such factor increases with the square of the device width. We also discuss the accuracy of two commonly used approximations of the scattering self-energies: the neglect of the off-diagonal entries in the mode-space expressions and the neglect of the Hermitian part of the retarded self-energy. While the latter is an acceptable approximation in most bias conditions, the former is somewhat inaccurate when the device is in the off-state and optical phonon scattering is essential in determining the current via band-to-band tunneling. Finally, we show that, in the presence of a disordered potential, a coupled mode space approach is necessary, but the results are still accurate compared to the real-space solution." @default.
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• W2016005113 date "2013-04-10" @default.
• W2016005113 modified "2023-10-17" @default.
• W2016005113 title "Mode space approach for tight-binding transport simulations in graphene nanoribbon field-effect transistors including phonon scattering" @default.
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• W2016005113 doi "https://doi.org/10.1063/1.4800900" @default.
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