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Title: Understanding the origin of bandgap problem in transition and post-transition metal oxides

Journal Article · · Journal of Chemical Physics
DOI: https://doi.org/10.1063/1.5111188 · OSTI ID:1594893
 [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [5]
  1. Tsinghua Univ., Beijing (China); Rensselaer Polytechnic Institute, NY, US
  2. Inst. of Applied Physics and Computational Mathematics, Beijing (China)
  3. Beijing Inst. of Technology (China)
  4. Tsinghua Univ., Beijing (China); Tsinghua Univ., Beijing (China)
  5. Rensselaer Polytechnic Inst., Troy, NY (United States)

Improving electronic structure calculations for practical and technologically-important materials has been a never-ending pursue. This is especially true for transition and post-transition metal oxides for which the current first-principles approaches still suffer various drawbacks. Here we present a hierarchical-hybrid functional approach built on the use of pseudopotentials. The key is to introduce a discontinuity in the exchange functional between core and valence electrons. It allows for treating the localization errors of sp and d electrons differently, which have been known to be an important source of error for the band structure. Using ZnO as a prototype, we show the approach is successful in simultaneously reproducing the band gap and d-band position. Remarkably, the same approach, without having to change the hybrid mixing parameters from those of Zn, works reasonably well for other binary 3d transition and post-transition metal oxides across board. Finally, our findings point to a new direction of systematically improving the exchange functional in first-principles calculations.

Research Organization:
Rensselaer Polytechnic Inst., Troy, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC)
Grant/Contract Number:
SC0002623
OSTI ID:
1594893
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 12 Vol. 151; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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