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Efficient G0W0 and Bethe-Salpeter equation calculations of heterostructures within an all-electron framework

Maximilian Schebek1,2,*,†, Ignacio Gonzalez Oliva1,*, and Claudia Draxl1,3

  • *These authors contributed equally to this work.
  • †Contact author: m.schebek@fu-berlin.de
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Phys. Rev. B 112, 165130 – Published 20 October, 2025

DOI: https://doi.org/10.1103/hm7q-y2x7

Abstract

The combination of two-dimensional materials into heterostructures offers new opportunities for the design of optoelectronic devices with tunable properties. However, computing electronic and optical properties of such systems using state-of-the-art methodology is challenging due to their large unit cells. This is particularly so for highly precise all-electron calculations within the framework of many-body perturbation theory, which come with high computational costs. Here, we extend an approach that allows for the efficient calculation of the noninteracting polarizability, previously developed for plane wave basis sets, to the (linearized) augmented plane wave method. This approach is based on an additive ansatz, which computes and superposes the polarizabilities of the individual components in their respective unit cells. We implement this formalism in the G0W0 module of the exciting code and implement an analogous approach for BSE calculations. This allows the calculation of highly precise optical spectra at low cost. So-obtained results of the quasiparticle band structure and optical spectra are demonstrated for bilayer WSe2 and pyridine@MoS2 in comparison with exact reference calculations.

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Outline

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Phys. Rev. B 112, 165130– Published 20 October, 2025
  • Received 24 July 2025
  • Revised 17 September 2025
  • Accepted 24 September 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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