mirror of https://github.com/abinit/abinit.git
37 lines
1.4 KiB
Markdown
37 lines
1.4 KiB
Markdown
---
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description: How to compute the linewidth (or lifetime) of phonons, due to the electron-phonon interaction
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authors: MV
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---
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<!--- This is the source file for this topics. Can be edited. -->
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This page gives hints on how to compute the linewidth (or lifetime) of phonons, due to the electron-phonon
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interaction with the ABINIT package.
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## Introduction
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This topic concerns metals only.
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After generating a GKK file (see [[topic:ElPhonInt]]), the Electron-Phonon
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Coupling (EPC) analysis is performed in anaddb, setting [[anaddb:elphflag]]
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variable to 1. Most of the procedure is automatic, but can be lengthy if a
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large number of k-points is being used. The [[anaddb:nqpath]] and
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[[anaddb:qpath]] variables must be set, specifying a path in reciprocal space.
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anaddb generates files containing the phonon linewidths (suffixed `_LWD`) and
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frequencies ωqj (suffixed `_BST`) along [[anaddb:qpath]]. One can calculate the
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nesting function n(q) = ∑kii' δ(εk,i) δ(εk+q,i') by setting [[anaddb:prtnest]]
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to 1 (output to `_NEST`).
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## Related Input Variables
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{{ related_variables }}
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## Selected Input Files
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{{ selected_input_files }}
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## Tutorials
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* The tutorial on the [[tutorial:eph_legacy|electron-phonon interaction]] presents the use of the utility MRGKK and ANADDB to examine the electron-phonon interaction and the subsequent calculation of superconductivity temperature (for bulk systems).
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