Temperature dependent effective third order interatomic force constants from first principles

Abstract

The temperature dependent effective potential (TDEP) method is generalized beyond pair interactions. The second and third order force constants are determined consistently from ab initio molecular dynamics simulations at finite temperature. The reliability of the approach is demonstrated by calculations of the Mode Grüneisen parameters for Si. We show that the extension of TDEP to higher order allows for an efficient calculation of the phonon life time, in Si as well as in $\epsilon$-FeSi, a system that exhibits anomalous softening with temperature.

References in corpus (2)

• Temperature dependent effective potential method for accurate free energy calculations of solids
• Spectral and Fermi surface properties from Wannier interpolation

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