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Boltzmann Transport Simulator for CNTs

By Zlatan Aksamija1, Umberto Ravaioli2

1. University of Wisconsin-Madison 2. University of Illinois at Urbana-Champaign

Simulate Electron transport in Single-walled carbon nanotubes using an upwinding discretization of the Boltzmann transport equation in the relaxation time approximation.

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Version 1.0.1 - published on 20 Oct 2009

doi:10.4231/D3VH5CH7M cite this

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  1. 0 Like 0 Dislike

    Anonymous

    4.0 out of 5 stars

    Introductory comments

    This nanohub program is available at DOI page. It is a very good tool to understand the basics of Monte Carlo simulation. It simulates carrier transport in a carbon nanotube with a constant electric field across its length (it does not have a gate) The author presented this tool in the class for this course and explained its working. The presentation for this tool is 1.

    This tool can be used in three different modes:

    • Transient response to a step voltage application across the ends of the nanotube.
    • DC sweep of the voltage across the ends of the nanotube.
    • Length sweep for the carrier density and potential at each point along the nanotube length.
  2. The tool operates in two phases. The first phase is the setup phase where look-up-tables, dispersion, mesh, and electric field etc. are set up. The second phase is a Monte-Carlo simulation. Input

    This page can take inputs on the applied bias (VDS), length of the nanotube (L), chiral vector (n,m) of the edge, temperature (T). The user can discretize in real space, k-space and time. Setup

    The tool first begins by calculating the electronic band structure and phonon dispersion of the carbon nanotube and makes scattering tables before beginning a simulation. There is no need for any Poisson’s solver in this tool because there is no gate voltage. So a fixed field of E=\\frac} is assumed and all particles are accelerated by a constant electric field. Monte Carlo

    A general outline of the Monte Carlo method shall follow in this paragraph. Individual carriers are simulated from the drain to the source keeping track of their momentum as is accelerated by the field. But with each time step the electric field in the channel due to a non-equilibrium distribution of the charges is updated – this is a minor correction to the electric field. Also, at each time step a random number is generated and based on the value of the random number a choice of a scattering event is made. The scattering probabilities are evaluated based on the scattering table that was calculated in the first step. The self-consistent solution emerges after several iterations of this solver. Feedback for the tool

    • The tool’s Abort simulation button does not really work. This can be irritating if the user is playing around with the inputs and accidentally sets a very long simulation.
    • It might be useful to include an option for a gate.
    • The DC sweep simulation does not

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    Anonymous

    5.0 out of 5 stars

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    Anonymous

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  • nanoHUB.org, a resource for nanoscience and nanotechnology, is supported by the National Science Foundation and other funding agencies. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.