spatial region extended into the centre region, not calculated during electrode

[techenthusiast]

Good evening, Hope you are doing well. Just to ask :
How to give proper metallic contact to source & drain in quantum atk . It's showing "Spatial regions extending into the electrodes are ignored during the electrode calculation"
Just to ask
:how to avoid or solve  " spatial region extended into the centre region, not calculated during electrode calculation in quantum atk"

Thank you




How to put proper dielectric & metal exactly at the centre region of the device?

Kindly let me know. Thank you.

[Anders Blom]

Spatial regions are not supposed to be contacts, since they will not be able to conduct hold any current. They are only meant to be used for electrostatic control, like gates. Your source and drain need to be fully atomistic structures which are part of the DFT-NEGF calculation.

[techenthusiast]

Thank You for your prompt response. One small doubt is that -
In this example ( https://docs.quantumatk.com/tutorials/ivcharacteristics/ivcharacteristics.html ) we can visualize the explanation for two sided [top, bottom] gate & dielectric

But the procedure for IV study for cylindrical wrap around gate is similar to this? or maybe different or maybe do-able with the same above tutorials

(https://docs.quantumatk.com/manual/Types/IVCharacteristics/IVCharacteristics.html#usage-example)

Kindly advise. Thank You very much once again.
 

[Anders Blom]

The IVCharacteristics framework is handy since it is restartable and provides a nice way to loop over all bias values and gate voltages. If you have multiple gates or a more complex system I recommend just running individual simulations or a script with a loop over values, and then collect the results in the end.

[techenthusiast]

Thank You for your kind advise. The system is a metallic wrap around gate across the central region (Channel).

Like this (Device_setup.py) -https://docs.quantumatk.com/manual/Types/IVCharacteristics/IVCharacteristics.html#usage-example

For tutorial I was following this (Top & bottom metallic box gate) -https://docs.quantumatk.com/tutorials/ivcharacteristics/ivcharacteristics.html

That's why probably I was bit confused  regarding the approach -whether it is same or not for both the cases.

Thank you once again.