Using high multipolar orders to reconstruct the sound velocity in piezoelectrics from lattice dynamics

Abstract

Information over the phonon band structure is crucial to predicting many thermodynamic properties of materials, such as thermal transport coefficients. Highly accurate phonon dispersion curves can be, in principle, calculated in the framework of density-functional perturbation theory (DFPT). However, well-established techniques can run into trouble (or even catastrophically fail) in the case of piezoelectric materials, where the acoustic branches hardly reproduce the physically correct sound velocity. Here we identify the culprit in the higher-order multipolar interactions between atoms, and demonstrate an effective procedure that fixes the aforementioned issue. Our strategy drastically improves the predictive power of perturbative lattice-dynamical calculations in piezoelectric crystals, and is directly implementable for high-throughput generation of materials databases.

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• Self-consistent electron lifetimes for electron-phonon scattering
• Precisely computing phonons via irreducible derivatives
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• Exact long-range dielectric screening and interatomic force constants in quasi-2D crystals
• Elastic Constants and Bending Rigidities from Long-Wavelength Perturbation Expansions