Messages

1

General Questions and Answers / Sweeping multiple metal gates WITH offset

« on: April 7, 2023, 01:54 »

I would like to sweep two distinct gates over some voltage range but want to keep a constant offset between them. This means suppose I simulate 5 bias points, they should be: [0.5, 1.5], [0.6, 1.6], [0.7, 1.7], [0.8, 1.8], and [0.9, 1.9], where the first entry is one gate voltage and the second entry is the other. Is this possible in the current Quantum-ATK version. (I have version 2019.12.980d1ca)

I am using this as my analysis where gate regions 1, 2, 5 correspond to one gate and 3, 4, 6 correspond to the other:

iv_characteristics = IVCharacteristics(
    configuration=device_configuration,
    filename=filename,
    object_id='ivcharacteristics',
    gate_regions=[1,2,5],
    gate_source_voltages=gate_source_voltages,
    drain_source_voltages=drain_source_voltages,
    energies=numpy.linspace(-0.03085, 0.03085, 61700)*eV,
    kpoints=kpoint_grid,
)

2

General Questions and Answers / Re: Exporting Density of States data

« on: February 22, 2023, 05:55 »

2019.12.980d1ca I'm pretty sure.

3

General Questions and Answers / Exporting Density of States data

« on: January 14, 2023, 18:50 »

I have run a density of states like so and I would like to extract the raw data:

iv_characteristics.addProjectedLocalDensityOfStates(
    gate_source_voltages = back_gate_source_voltages,
    drain_source_voltages = drain_source_voltages,
    energies=numpy.linspace(-0.01, 0.035, 6000)*eV, # 10ueV steps
)

I opened the Projected Local Density of States plot and clicked on Export --> export data as text file, but I get an error:
Traceback (most recent call last):
  File "zipdir/NL/GUI/Graphics/Plotter/PlotView/PlotView.py", line 389, in save
  File "zipdir/NL/GUI/Graphics/Plotter/IO/Export.py", line 131, in writeTXT
  File "zipdir/NL/GUI/Graphics/Plotter/IO/Export.py", line 159, in _dataToTXT
  File "zipdir/NL/GUI/Graphics/Plotter/IO/Export.py", line 212, in _data1DtoTXT
NameError: name 'dataToTXT' is not defined

I'm not sure where and how I should define `dataToTXT` or fix this issue.

Thank you!

4

General Questions and Answers / Density of states of a specific spin state

« on: August 12, 2022, 01:33 »

Hello!

I am trying to learn about the density of states in a quantum well; I have created the device. The DoS through the IV analysis gives me the density of states for "Spin: Sum". I would like to find this for just "Spin Up" and "Spin Down". Is this possible? What modifications will I have to make?

Thank you!