Relaxation time vs temperature in amset

Dear Developer,

As deformation potential approach is used to determine the scattering rate. So is there any provision to plot the relaxation time vs temperature in amset?

Thank You

Dear community,

If you have any answer regarding the above query about relaxation time, kindly tell me.

Thank You in advance!

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Hi @Sumit,

The scattering rate in AMSET is band and k-dependent so its not clear which scattering rate you mean. But you can plot the k-dependent rate at multiple temperatures if you want using the in-built plotters.

You should follow the instructions to:

  1. Generate the DFT input: Calculation Inputs - AMSET Documentation
  2. Run AMSET: Getting Started - AMSET Documentation

Ensure that write_mesh: true is set in the settings.yaml file.

Finally, you can plot the scattering rates at multiple temperatures using amset plot rates.

Dear Alex sir,

I mean to say in literature we found this formula to compute the relaxation time of material via the effective mass of carrier, elastic modulus, and deformation potential.
Amset is also considering the deformation potential approach and predicting acoustic deformation scattering and so on.
So, Is there any procedure to see the carrier’s relaxation time vs temperature?

Thank You, sir

Sumit Kukreti

AMSET doesn’t use that formula for calculating the scattering lifetime. The treatment in AMSET is more sophisticated and depends on the band index and k-point as well as carrier concentration and temperature. If you wanted, you could take the calculated lifetimes from AMSET and average them to obtain a single lifetime for a particular carrier concentration and then plot that vs temperature. However, with this approach you will need to consider carefully which bands and k-points you include in the averaging. For example, you will probably only want to consider the states close to the VBM or CBM.

A better approach is just to plot the band and k-dependent lifetimes directly using amset plot rates.