Impact of different electron-phonon scattering models on the electron transport in a quantum wire

4th Workshop on Theory, Modelling and Computational Methods for Semiconductors

物理学;计算机科学

Price, A.^1 ; Martinez, A.^1 ; Valin, R.^1 ; Barker, J.R.^2

College of Engineering, Swansea University, United Kingdom^1

School of Engineering, University of Glasgow, United Kingdom^2

关键词: Applied potentials;    Electron phonon scattering;    Electron transport;    Nearest-neighbour interactions;    Non-equilibrium Green's function;    Non-local interactions;    Self-consistent Born approximation;    Transport simulation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/526/1/012007/pdf
DOI  :  10.1088/1742-6596/526/1/012007

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The non-equilibrium Green's function (NEGF) approach has been widely used to describe quantum transport in nanostructures. In general, the Electron-phonon (e-ph) interaction is regarded to be local in space, as transport simulations using non-local e-ph interactions are very computationally intensive. As such non-local interactions are rarely used to simulate nanotransistors. In this work, non-local e-ph interactions in the self-consistent Born approximation (SCBA) are used to simulate transport through a quantum wire. The non-local model is compared with the results for local, nearest-neighbour and second nearest- neighbour interactions. It was found that for a 40nm quantum wire with a dephasing factor of D00.001eV2and an applied potential of 0.1V, the local model underestimates the current by 20%. Furthermore, to study electron transport in Graphene and polymers, non-local e-ph interactions must be considered.