QuantumATK Forum

QuantumATK => General Questions and Answers => Topic started by: holly on May 12, 2020, 05:23

Title: Projected local density of states
Post by: holly on May 12, 2020, 05:23

Dir Sir,

I have a question about the analysis of  Projected Local Density Of States (PLDOS), that is "How to only project  onto semicondunctor region of a FET device?"   I use the VNL 2019.3.
 
Thank you so much!

Title: Re: Projected local density of states
Post by: Daniele Stradi on May 13, 2020, 10:12

Hello,

Projected Local Density Of States (PLDOS) cannot be used for that, however, one can use the DeviceDensityOfStates to project over, e.g., atoms. In the example below, the DDOS is evaluated for atom 10 in the central region of the device:

ddos = nlread('device.hdf5',DeviceDensityOfStates)[-1]
ddos_projected = ddos.evaluate(projection_list = ProjectionList([10]))

Check also the usage examples in: https://docs.quantumatk.com/manual/Types/DeviceDensityOfStates/DeviceDensityOfStates.html

Best,
Daniele

Title: Re: Projected local density of states
Post by: holly on May 15, 2020, 10:27

Thanks for your reply!
But I have another question. I recently read some papers that can give local device densithy of states projeted semiconductor region, for example, in the image below. I want to know how to get this figure. Please tell me whether ATK can do it or not.
Thanks a lot!

Title: Re: Projected local density of states
Post by: Daniele Stradi on May 19, 2020, 09:23

Hi,

the heat maps can be generated by using the projected local density of states (PLDOS) analysis tool:
https://docs.quantumatk.com/manual/Types/ProjectedLocalDensityOfStates/ProjectedLocalDensityOfStates.html

The 2D plots can be generated by using the DeviceDensityOfStates (DDOS) object and by projecting on the atoms of the region of interest, in your specific case the semiconductor region:
https://docs.quantumatk.com/manual/Types/DeviceDensityOfStates/DeviceDensityOfStates.html 

Best regards,
Daniele