First-principles perturbative computation of dielectric and Born charge tensors in finite electric fields

Details First-principles perturbative computation of dielectric and Born charge tensors in finite electric fields First-principles perturbative computation of dielectric and Born charge tensors in finite electric fields

2006-12-17

arxiv.org/abs/cond-mat/0612442v1

Phys. Rev. B 75, 115116 (2007)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.75.115116

We present a perturbative treatment of the response properties of insulating crystals under a dc bias field, and use this to study the effects of such bias fields on the Born effective charge tensor and dielectric tensor of insulators. We start out by expanding a variational field-dependent total-energy functional with respect to the electric field within the framework of density-functional perturbation theory. The second-order term in the expansion of the total energy is then minimized with respect to the first-order wave functions, from which the Born effective charge tensor and dielectric tensor are easily computed. We demonstrate an implementation of the method and perform illustrative calculations for the III-V semiconductors AlAs and GaAs under finite bias field.

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