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Future Releases / Re: Usage of graphics card for future ATK technology
« on: May 17, 2014, 20:07 »
Any luck with this direction since 2009?!!!
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General Questions and Answers / Re: Graphene Device Length
« on: May 15, 2014, 18:55 »
1-Is it safe to use the Krylov self energy method for computation in this infinite 2D graphene device?
2- By any means , is there is a way to predict how long is still there, for a simulation to finish?!!!
2- By any means , is there is a way to predict how long is still there, for a simulation to finish?!!!
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General Questions and Answers / Re: Graphene Device Length
« on: May 15, 2014, 00:23 »
Seriously thank you for your patience and help.
1- So if I extend the length of the central region of this device in the Z direction, the results (I-V) should be the same.Since, Unlike nanoribbonz, extending graphene structure does not affect its electrical transport properties....correct?
2- Do I need accurate transmission spectrum when calculating I-V or a jagged one would do the job as well? Avoiding Time consumption.
1- So if I extend the length of the central region of this device in the Z direction, the results (I-V) should be the same.Since, Unlike nanoribbonz, extending graphene structure does not affect its electrical transport properties....correct?
2- Do I need accurate transmission spectrum when calculating I-V or a jagged one would do the job as well? Avoiding Time consumption.
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General Questions and Answers / Re: Graphene Device Length
« on: May 15, 2014, 00:08 »
So the central region is infinite in the Y direction, yet it is finite in the Z direction.
Isn't this a ribbon structure? Isn't a ribbon periodic in 1 direction and finite in the other?
Isn't this a ribbon structure? Isn't a ribbon periodic in 1 direction and finite in the other?
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General Questions and Answers / Re: Graphene Device Length
« on: May 14, 2014, 23:41 »
How can it be infinite in the Z plane, when one of the constraints of the device configuration is having a finite central region? Can it be?
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General Questions and Answers / Re: Graphene Device Length
« on: May 14, 2014, 16:49 »
Indeed yes, my question is : if I use such "smallest possible unit cell", will the electrodes length extend infinity as well with the graphene (in the Y direction)?
Another question please, is this a ribbon , or graphene with graphene transmission curves and zero band gap K point?
What I am looking for is an infinite graphene (not ribbons) I-V curve.
Another question please, is this a ribbon , or graphene with graphene transmission curves and zero band gap K point?
What I am looking for is an infinite graphene (not ribbons) I-V curve.
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General Questions and Answers / Re: Graphene Device Length
« on: May 14, 2014, 04:56 »
For the device shown on the picture on the attachment, this device is a 2d Graphene bulk infinite in the Y Direction, because there is no vaccum space. However, does ATK simulate it with long or short electrodes, as shown in the 2 figures attached with it. In other words, does the electrode length get repeated in the Y direction as well, or only the graphene?
They are png files,
If the electrodes length extends with the graphene in the Y direction, then I can assume that the electric field I inserted as Vg, is distributed uniformly across all the grpahene . Other wise it is only limited to the length of the electrodes, I inserted in the builder.
MY FINAL OBJECTIVE HERE, IS TO INSERT GATE VOLTAGE THAT WILL PRODUCE REALISTIC I-V VALUES, THAT WOULD BE CONFIRMED EXPERIMENTALLY.
They are png files,
If the electrodes length extends with the graphene in the Y direction, then I can assume that the electric field I inserted as Vg, is distributed uniformly across all the grpahene . Other wise it is only limited to the length of the electrodes, I inserted in the builder.
MY FINAL OBJECTIVE HERE, IS TO INSERT GATE VOLTAGE THAT WILL PRODUCE REALISTIC I-V VALUES, THAT WOULD BE CONFIRMED EXPERIMENTALLY.
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General Questions and Answers / Re: Graphene Device Length
« on: May 12, 2014, 06:30 »
MY DEVICE:
CENTRAL (BULK 2D GRAPHENE) with length of 2.85 nm.
LEFT & RIGHT ELECTRODES OF THE SAME GRPAHENE AS WELL. 8 Angstorm each.
I need to simulate 100 nm device.
So I will sample it 35 (100nm/2.85nm) times in the C axis.
Does this do the job?
CENTRAL (BULK 2D GRAPHENE) with length of 2.85 nm.
LEFT & RIGHT ELECTRODES OF THE SAME GRPAHENE AS WELL. 8 Angstorm each.
I need to simulate 100 nm device.
So I will sample it 35 (100nm/2.85nm) times in the C axis.
Does this do the job?
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General Questions and Answers / Re: hello
« on: May 8, 2014, 04:13 »
A very good question indeed, any luck with answers?!! since april 18th.
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Scripts, Tutorials and Applications / MOVED: Graphene Device Length
« on: May 8, 2014, 00:02 »
This topic has been moved to Questions and Answers.
http://quantumwise.com/forum/index.php?topic=2816.0
http://quantumwise.com/forum/index.php?topic=2816.0
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General Questions and Answers / Graphene Device Length
« on: May 7, 2014, 17:51 »
I have a 40 Angstorm long bulk 2D infinite graphene sampled in the C direction 5 times, how long is the effective length of the graphene device simulated?
In another words, how to know the exact length of your structure depending on the sampling points you take?
In another words, how to know the exact length of your structure depending on the sampling points you take?
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