Author Topic: graphene nanoribbon transistor tutorial problem  (Read 343 times)

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Offline narin

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graphene nanoribbon transistor tutorial problem
« on: February 10, 2024, 14:46 »
Hello

i have checked the tutorial given on the following page: https://docs.quantumatk.com/tutorials/graphene_nanoribbon_device/graphene_nanoribbon_device.html#graphene-nanoribbon-device

the conductance obtained in the given example changes about 20 times for the gate voltages of 0V and -2V. however, the reference paper given here: https://doi.org/10.1021/nl070133j shows that the conductance changes 2000 times for the gate voltages of 0V and -2V.

What is the source of the big difference between the results given in the reference paper and the tutorial?

thanks.

Offline Anders Blom

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Re: graphene nanoribbon transistor tutorial problem
« Reply #1 on: February 13, 2024, 01:02 »
Although the tutorial was actually inspired by this paper, the width of the ribbon is quite different. I think that is a major factor. We do use a fast Huckel model in the tutorial vs DFT in the paper, but if the band structure is similar, this should not play a significant role (not orders of magnitude).

Offline narin

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Re: graphene nanoribbon transistor tutorial problem
« Reply #2 on: February 13, 2024, 12:39 »
Thanks, I will try by changing the width and report here.