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self_interaction_corrections_for_periodic_systems_final.pdf (1.23 MB)

Improved Band Gaps and Structural Properties from Wannier-Fermi-Lowdin Self-Interaction Corrections for Periodic Systems

preprint
submitted on 14.10.2020 and posted on 15.10.2020 by Ravindra Shinde, Sharma Yamijala, Bryan Wong
The accurate prediction of band gaps and structural properties in periodic systems continues to be one of the central goals of electronic structure theory. However, band gaps obtained from popular exchange-correlation functionals (such as LDA and PBE) are severely underestimated partly due to the spurious self-interaction error (SIE) inherent to these functionals. In this work, we present a new formulation and implementation of Wannier function-derived Fermi-Lowdin (WFL) orbitals for correcting the SIE in periodic systems. Since our approach utilizes a variational minimization of the self-interaction energy with respect to the Wannier charge centers, it is computationally more efficient than the HSE hybrid functional and other self-interaction corrections that require a large number of transformation matrix elements. Calculations on several (17 in total) prototypical molecular solids, semiconductors, and wide-bandgap materials show that our WFL self-interaction correction approach gives better band gaps and bulk moduli compared to semilocal functionals, largely due to the partial removal of self-interaction errors.

Funding

U.S. Department of Energy, Office of Science, Early Career Research Program under Award No. DE-SC0016269

History

Email Address of Submitting Author

usagi@alum.mit.edu

Institution

University of California, RIverside

Country

United States

ORCID For Submitting Author

0000-0002-3477-8043

Declaration of Conflict of Interest

no conflict of interest

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