TDDFT calculations for excitation spectra of III-V ternary alloys

Abstract

We adopted the time-dependent density functional theory (TDDFT) within the linear augmented Slater-type orbitals (LASTO) basis and the cluster averaging method to compute the {\color{red}excitation} spectra of III-V ternary alloys with arbitrary concentration $x$. The TDDFT was carried out with the use of adiabatic meta-generalized gradient approximation (mGGA), which contains the $1/q^2$ singularity in the dynamical exchange-correlation kernel ($f_{XC,00}(\mathbf{q})$) as $q\to 0$. We found that by using wave functions obtained in local density approximation (LDA) while using mGGA to compute self-energy correction to the band structures, we can get {\color{red} good overall} agreement between theoretical results and experimental data for the excitation spectra. Thus, our studies provide some insight into the theoretical calculation of optical spectra of semiconductor alloys.

8 pages, 5 figures. Accepted by PRB

References in corpus (2)

• Bootstrap approximation for the exchange-correlation kernel of time-dependent density functional theory
• Optics of semiconductors from meta-GGA-based time-dependent density-functional theory

Cited by in corpus (1)

• Multipath optical recombination of intervalley dark excitons and trions in monolayer WSe${}_2$