ELPH SCATTERING APPROX: Difference between revisions
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{{DISPLAYTITLE:ELPH_SCATTERING_APPROX}} | {{DISPLAYTITLE:ELPH_SCATTERING_APPROX}} | ||
{{TAGDEF|ELPH_SCATTERING_APPROX|[string]| SERTA MRTA_LAMBDA}} | {{TAGDEF|ELPH_SCATTERING_APPROX|[string]| SERTA MRTA_LAMBDA}} | ||
Description: Select which type of approximation is used to compute the electron scattering due to electron-phonon coupling | Description: Select which type of approximation is used to compute the electron scattering lifetimes due to electron-phonon coupling | ||
---- | ---- | ||
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 === | === CRTA === | ||
Constant relaxation time approximation | Constant relaxation time approximation | ||
Revision as of 14:24, 18 December 2024
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
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.