ELPH_SELFEN_MU

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Revision as of 10:00, 18 October 2024 by Miranda.henrique (talk | contribs) (Created page with "{{elph_release}} {{DISPLAYTITLE:ELPH_SELFEN_MU}} {{TAGDEF|ELPH_SELFEN_MU|[real array]|0.0}} Description: list of chemical potentials at which to compute the electron-phonon self-energy and transport coefficients. ---- Each chemical potential specified in the list will be added to the Fermi energy determined for the <b>k</b> point grid {{FILE|KPOINTS_ELPH}}. This Fermi energy might be different from the one determined in the self-consistent calculation if the <b>k</b>...")
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ELPH_SELFEN_MU = [real array]
Default: ELPH_SELFEN_MU = 0.0 

Description: list of chemical potentials at which to compute the electron-phonon self-energy and transport coefficients.


Each chemical potential specified in the list will be added to the Fermi energy determined for the k point grid KPOINTS_ELPH. This Fermi energy might be different from the one determined in the self-consistent calculation if the k point meshes or ELPH_ISMEAR is different from ISMEAR. The Fermi energy from the self-consistent and non-self-consistent calculations can be read from the OUTCAR file. For example

$grep "Fermi energy" OUTCAR
 Fermi energy:         3.5134142202
 Fermi energy:         3.5314189274 eV (dense k-point grid)

In this example, ELPH_SELFEN_MU means that the chemical potential will be set to 3.5314189274+0.1 eV. This can be verified Chemical potential calculation section of the OUTCAR file.


                  Number of electrons per cell
                  ----------------------------
T=      0.00000000    18.00000452
T=    100.00000000    18.00000536
T=    200.00000000    18.00000792
T=    300.00000000    18.00001223
T=    400.00000000    18.00001792
T=    500.00000000    18.00002315
                  ----------------------------
                      Chemical potential
                  ----------------------------
T=      0.00000000     3.63141893
T=    100.00000000     3.63141893
T=    200.00000000     3.63141893
T=    300.00000000     3.63141893
T=    400.00000000     3.63141893
T=    500.00000000     3.63141893
                  ----------------------------

For each of these chemical potentials and temperatures, the number of electrons per cell is computed and reported. These, in turn, be converted to a carrier density by dividing be the volume of the unit cell.

Alternatively, one can specify the additional carrier density in units of by using the ELPH_SELFEN_CARRIER_DEN tag.