Jing Yang^1*, Stefano Falletta^1*, Alfredo Pasquarello^1*

1 Chaire de Simulation à l’Echelle Atomique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

* Corresponding authors emails: jing.yang@epfl.ch, stefano.falletta@epfl.ch, alfredo.pasquarello@epfl.ch

DOI10.24435/materialscloud:9b-zz [version v1]

Publication date: Mar 15, 2022

How to cite this record

Jing Yang, Stefano Falletta, Alfredo Pasquarello, One-shot approach for enforcing piecewise linearity on hybrid functionals: application to band-gap predictions, Materials Cloud Archive 2022.40 (2022), https://doi.org/10.24435/materialscloud:9b-zz

Description

We present an efficient procedure for constructing nonempirical hybrid functionals to accurately predict band gaps of extended systems. We determine mixing parameters by enforcing the generalized Koopmans’ condition on localized electron states, which are achieved by inserting an optimized potential probe. Application of this scheme to a large set of materials yields band gaps with a mean error of 0.30 eV with respect to experiment. Next, we consider a perturbative one-shot approach in which the single- particle eigenvalues are calculated with the wave functions obtained at the semilocal level. In this way, the computational cost is reduced by ∼85% without loss of accuracy. The scheme is found to be robust upon consideration of different defect species and functional forms.

Materials Cloud sections using this data

Files

File name	Size	Description
README.md MD5md5:e86bbdd4a3206bb997515f6f77ada445	1.8 KiB	description file
QE_source_code.zip MD5md5:cee5bdfeb9200dfa01420f0f0f301b1d	14.1 KiB	source code for compiling the one-shot version of Quantum Espresso
QE_input_files.zip MD5md5:05c90a92d3b90a719ba6232786543844	41.9 KiB	input files for defect calculations in Quantum Espresso
generating_potential_probe.zip MD5md5:9aab719e7cc6deac3a18ba4da03bf3f7	2.4 KiB	script for generating pseudopotential of the potential probe
Koopmans_scheme.zip MD5md5:3ac2bc78c16027a9b7d2361f4547a7e8	53.2 MiB	script for Koopmans' method

License

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External references

Keywords

density-functional theory pseudopotentials Quantum ESPRESSO SNSF MARVEL/DD4