Messages

1

General Questions and Answers / Charge transfer mechanism through bunch of ghost atoms

« on: October 14, 2018, 10:22 »

What is the charge transfer mechanism that is followed in ghost atoms in M-I-S-M device structure? That is Metal- Insulator- Space(ghost atoms)- Metal devices. Is it any kind of tunneling like direct/FN or charge hopping?

2

General Questions and Answers / Re: Scanning Tunneling Micro scopy STM : usage example for v2018.06

« on: October 14, 2018, 10:14 »

But there is no usage example

3

General Questions and Answers / Re: Scanning Tunneling Micro scopy STM : usage example for v2018.06

« on: October 6, 2018, 19:04 »

Though in ref. manual it say STM analysis under Bulk Analysis but it is not in software.

4

General Questions and Answers / Scanning Tunneling Micro scopy STM : usage example for v2018.06

« on: October 6, 2018, 18:53 »

Hi,
      I was looking for usage example for STM kind of calculation in latest ATK v2018.06. But unable to find any. can anyone please share the example script for such calculations. Moreover I was expecting a new bulk to device tool in builder in v2018.06 or else STM analysis in Analysis section. But unable to found any. If anyone able to utilize the keyword meant for STM study then kindly share.

5

General Questions and Answers / what is the formulation for calculation of transmission coefficient in VNL ATK

« on: December 21, 2017, 13:49 »

I was looking for the formulation for transmission coefficient used in VNL ATK. Is it Breit-Wigner formula? can you provide related reference?

6

General Questions and Answers / Re: difference in current value of IV plot and Transmission Analyzer

« on: July 20, 2017, 09:57 »

Please share your e-mail address.

7

General Questions and Answers / difference in current value of IV plot and Transmission Analyzer

« on: July 19, 2017, 16:41 »

Hi

I'm re-posting this issue that i encountered few months ago. see the conversation at (https://quantumwise.com/forum/index.php?topic=4894.msg21177#msg21177) where I raised that the different in current value by IV plot and transmission analyser. I re-run the entire process considering same parameters as in IV curve analysis and FBTS analysis. But problem still persist. I request you to please send your e mail address so that i can send you desired scripts.

8

General Questions and Answers / Re: device bandstructure

« on: July 5, 2017, 08:39 »

Is it possible to plot band-structure diagram for devices with the help of VNL-ATK? I'm using 2014.3 version and didn't find any analyser for band-structure.

9

General Questions and Answers / Re: STM kind of calculations through VNL-ATK 2014.3

« on: June 14, 2017, 09:22 »

Hi daniele

If you know of any available tutorials like example script or any video might be great help to me.

Thanks

10

General Questions and Answers / STM kind of calculations through VNL-ATK 2014.3

« on: June 14, 2017, 08:44 »

Hi

I would like to know that is it possible to perform scanning tunnelling microscopy (STM) kind of calculations with the help of VNL-ATK 2014.3 through python script? I was checking into Manual section and I found keyword for STM calculations http://docs.quantumwise.com/manuals/Types/STM/STM.html . I just want to know if ATK 2014.3 is able to read this keyword?

Thanks

11

General Questions and Answers / difference in current value of IV plot and Transmission Analyzer

« on: February 13, 2017, 08:52 »

Hi

I was trying to analyse the transmission eigen states post-IV. In transmission analyzer I noticed that the value of current was different from that obtained from IV plot at same bias voltage. can you please explain why this is so?

Thank you

12

General Questions and Answers / Re: Eigen State Calculation error

« on: August 7, 2016, 13:47 »

It was generated by ATK 2014.3 only, rather before this run, i gave another run for quantum numbers near to HOMO LUMO levels and there was no problem for executing that.

13

General Questions and Answers / Eigen State Calculation error

« on: August 6, 2016, 11:42 »

Hi,

I was trying to determine the Eigen States for my device for quantum numbers somewhat far from those near to HOMO and LUMO levels but end up with following error. I can't figure out why it is showing incompatibility error though i made the script from current version only. Please look at the error message.

Traceback (most recent call last):
File "./zipdir/NL/GUI/MainWindow/LabFloor/LabFloorModel.py", line 201, in load
File "/opt/QuantumWise/atk-13.8.1/vnl/lib/python2.7/site-packages/AddOns/ATKNCImporter/ATKNCImporter.py", line 138, in load
return nlread(filename, object_id=object_id, read_state=False)[0]
File "./zipdir/NL/IO/NLSaveUtilities.py", line 327, in nlread
NLIOError: The NetCDF file, 'Au_ddq_OG_test5_Au_ES1.nc', cannot be read by the current version of ATK (ATK 13.8.1), since the file is generated by an incompatible (probably later) version (ATK 2014.3).

Thank you

14

Scripts, Tutorials and Applications / Python Script keywords library

« on: March 19, 2016, 09:24 »

Hi All,

From where I can find the list of all python script keywords used in VNL-ATK.


Thank you

15

General Questions and Answers / Re: Significance and meaning of LDDOS Plot

« on: February 12, 2016, 12:57 »

I can't figure out why this is important? Though while plotting DOS with the help of 1D Projector i got following plot PFA. Maybe averaging along C axis is not required but, is it destroying the LDDOS plot in anyway?
Moreover i did't find this line
avg_z = ldos.axisProjection('average', 'c')
in either of my scripts.