ELPH ISMEAR: Difference between revisions
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Description: Chooses the smearing method to determine the fermi level and chemical potential before an electron-phonon calculation. | Description: Chooses the smearing method to determine the fermi level and chemical potential before an electron-phonon calculation. | ||
{{Available|6.5.0}} | |||
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== Tag options == | == Tag options == | ||
;{{ | ;{{TAG|ELPH_ISMEAR|1|op=>}} | ||
:Method of Methfessel-Paxton of order {{TAG|ELPH_ISMEAR}} (for details see {{TAG|ISMEAR}}) | :Method of Methfessel-Paxton of order {{TAG|ELPH_ISMEAR}} (for details see {{TAG|ISMEAR}}) | ||
;{{ | ;{{TAG|ELPH_ISMEAR|0}} | ||
:Gaussian smearing (for details see {{TAG|ISMEAR}}) | :Gaussian smearing (for details see {{TAG|ISMEAR}}) | ||
;{{ | ;{{TAG|ELPH_ISMEAR|-1}} | ||
:Fermi-Dirac smearing (for details see {{TAG|ISMEAR}}) | :Fermi-Dirac smearing (for details see {{TAG|ISMEAR}}) | ||
;{{ | ;{{TAG|ELPH_ISMEAR|-4}} | ||
:Tetrahedron method (zero temperature) (for details see {{TAG|ISMEAR}}) | :Tetrahedron method (zero temperature) (for details see {{TAG|ISMEAR}}) | ||
;{{ | ;{{TAG|ELPH_ISMEAR|-5}} | ||
:Tetrahedron method (zero temperature) with Blöchl corrections (for details see {{TAG|ISMEAR}}) | :Tetrahedron method (zero temperature) with Blöchl corrections (for details see {{TAG|ISMEAR}}) | ||
;{{ | ;{{TAG|ELPH_ISMEAR|-14}} | ||
:Tetrahedron method (finite temperature) | :Tetrahedron method (finite temperature) | ||
;{{ | ;{{TAG|ELPH_ISMEAR|-15}} | ||
:Tetrahedron method (finite temperature) with Blöchl corrections | :Tetrahedron method (finite temperature) with Blöchl corrections | ||
;{{TAG|ELPH_ISMEAR|-24}} | |||
:Tetrahedron method (finite temperature) - same as -14 but using a faster and memory saving algorithm | |||
==Related tags and articles== | ==Related tags and articles== | ||
Latest revision as of 13:07, 24 October 2025
ELPH_ISMEAR = -15 | -14 | -5 | -4 | -1 | 0 | [integer]>0
Default: ELPH_ISMEAR = 0
Description: Chooses the smearing method to determine the fermi level and chemical potential before an electron-phonon calculation.
| Mind: Available as of VASP 6.5.0 |
ELPH_ISMEAR is very similar to ISMEAR. The difference is that ELPH_ISMEAR is used to determine the chemical potential in the context of electron-phonon calculation. The Kohn-Sham states for which to calculate the chemical potential correspond to the k-point grid specified via the KPOINTS_ELPH file.
The chemical potential is determined for the list of temperatures ELPH_SELFEN_TEMPS and carrier concentrations specified by ELPH_SELFEN_CARRIER_DEN or ELPH_SELFEN_CARRIER_PER_CELL. Alternatively, one can specify the chemical potential and determine the carrier concentration using ELPH_SELFEN_MU.
Tag options
ELPH_ISMEAR > 1- Method of Methfessel-Paxton of order ELPH_ISMEAR (for details see ISMEAR)
ELPH_ISMEAR = 0- Gaussian smearing (for details see ISMEAR)
ELPH_ISMEAR = -1- Fermi-Dirac smearing (for details see ISMEAR)
ELPH_ISMEAR = -4- Tetrahedron method (zero temperature) (for details see ISMEAR)
ELPH_ISMEAR = -5- Tetrahedron method (zero temperature) with Blöchl corrections (for details see ISMEAR)
ELPH_ISMEAR = -14- Tetrahedron method (finite temperature)
ELPH_ISMEAR = -15- Tetrahedron method (finite temperature) with Blöchl corrections
ELPH_ISMEAR = -24- Tetrahedron method (finite temperature) - same as -14 but using a faster and memory saving algorithm