ELPH_SCATTERING_APPROX

ELPH_SCATTERING_APPROX = [string]
Default: ELPH_SCATTERING_APPROX = SERTA MRTA_LAMBDA 

Description: Select which type of approximation is used to compute the electron scattering lifetimes due to electron-phonon coupling

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There are different approximations to compute the electronic lifetimes due to electron-phonon scattering. Each of these can lead to significantly different transport coefficients.

Options to select

CRTA

Constant relaxation time approximation

SERTA

Self-energy relaxation time approximation

ERTA_LAMDBA

Energy relaxation time approximation (mean-free path approximation)

ERTA_TAU

Energy relaxation time approximation (lifetime approximation)

MRTA_LAMDBA

Momentum relaxation time approximation (mean-free path approximation)

MRTA_TAU

Momentum relaxation time approximation (lifetime approximation)

Note that when the CRTA option is selected, the reading of the phelel_params.hdf5 file and calculation of electron self-energy is completely skipped.