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Relaxation time approximations in PAOFLOW 2.0

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arxiv 2111.09274 v1 pith:XCHDKVTG submitted 2021-11-17 cond-mat.mtrl-sci

Anooja Jayaraj , Ilaria Siloi , Marco Fornari , Marco Buongiorno Nardelli This is my paper
classification cond-mat.mtrl-sci
keywords relaxationtimeapplyapproximationapproximationsexperimentalmodelmodels
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Regardless of its success, the constant relaxation time approximation has limited validity. Temperature and energy dependent effects are important to match experimental trends even in simple situations. We present the implementation of relaxation time approximation models in the calculation of Boltzmann transport in PAOFLOW 2.0 and apply those to model band-structures. In addition, using a self-consistent fitting of the model parameters to experimental conductivity data, we provide a flexible tool to extract scattering rates with high accuracy. We illustrate the approximations using simple models and then apply the method to GaAs, Si, Mg3Sb2, and CoSb3.

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