# Release notes of nextnano.NEGF¶

## 2022-06-13¶

1. Units in LO-phonon scattering rates have been fixed.

2. Now the license nnNEGF.lic is supported.

## 2022-04-29¶

1. The in-plane nonparabolicity model introduced in the previous update has been fixed.

<Materials>
...
<InPlaneNonParabolicity>yes</InPlaneNonParabolicity>
...
</Materials>

1. The LO-phonon scattering rate output has been fixed.

## 2022-03-14¶

1. Linear alloy grading is now possible:

<Layer> <!-- all the material parameters will be linearily interpolated between the <Material1> and the <Material2> -->
<Material1>mat1</Material1>
<Material2>mat2</Material2>
<Thickness unit="nm">5.0</Thickness>
</Layer>


2. The in-plane nonparabolicity for multiband models can be activated with the command <InPlaneNonParabolicity>yes</InPlaneNonParabolicity> inside the block <Materials>...<\Materials>.

1. In the 2- and 3-band models, nonparabolicity coefficient can be used as in input material parameter. If specified, it will be used to overwrite the k.p parameters.

<Material>
<Name>In(x)Ga(1-x)As</Name>
<Alloy_Composition>0.53</Alloy_Composition>
<Alias>well</Alias>
<Effective_mass_from_kp_parameters>no</Effective_mass_from_kp_parameters>
<Overwrite>
<NonParabolicity Unit="cm^2">1.5e-14</NonParabolicity>
</Overwrite>
</Material>


4. The individual scattering rates of LO-phonon, alloy disorder and interface roughness can be output.