Messages

1

General Questions and Answers / Re: Unable to replicate Graphene junction device tutorial in ATK 13.8

« on: November 6, 2013, 11:25 »

Thank you for the quick response. The self-consistent model is set. See line 357 in the previously attached device configuration. If the simulation was not self-consistent i would not have got band shifting at Vg=-10v. The problem is that gate voltage is not having the same effect as described in the tutorial, even when the procedure is followed exactly.  I actually came across this problem when trying to backgate a CNT, so i tried the graphene tutorial and even that failed as mentioned.

2

General Questions and Answers / Unable to replicate Graphene junction device tutorial in ATK 13.8

« on: November 5, 2013, 10:05 »

Hello everybody,

Tried to replicate the graphene junction tutorial :http://quantumwise.com/documents/tutorials/latest/GrapheneDevice/index.html/ in ATK 13.8, there are no errors in execution but the gate voltage is having negligible effect on the device. At Vg=-1V Neither does the transmission spectrum shift, nor can we observe the expected ElectrostaticDifferencePotential (deltaVH range obtained is 1.3e-8 to 0.054 eV).  All steps mentioned in the tutorial have been followed explicitly. Upon further examination, if Vg=-10V, bands are shifted up by 2.4eV and ElectrostaticDifferencePotential deltaVH range obtained is (6.5e-7 to 0.37 eV) . I have attached the device configuration, and relevant plots. Can anyone please help me out?