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Understanding band gaps of solids in generalized Kohn–Sham theory

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [7];  [8];  [9];  [9];  [10];  [11];  [11]
  1. Temple Univ., Philadelphia, PA (United States). Dept. of Physics, and Dept. of Chemistry
  2. Duke Univ., Durham, NC (United States). Dept. of Chemistry
  3. Univ. of California, Irvine, CA (United States). Dept. of Chemistry, and Dept. of Physics
  4. Temple Univ., Philadelphia, PA (United States). Dept. of Physics; Microsystem and Terahertz Research Center, Chengdu, Sichhuan (China)
  5. Max-Planck Inst. für Mikrostrukturphysik, Halle (Germany)
  6. Fritz-Haber-Inst. der Max-Planck-Gesellschaft, Berlin (Germany); Univ. of California, Santa Barbara, CA (United States). Dept. of Chemistry and Biochemistry, and Materials Dept.
  7. Rice Univ., Houston, TX (United States). Dept. of Chemistry, and Dept. of Physics and Astronomy
  8. Fritz-Haber-Inst. der Max-Planck-Gesellschaft, Berlin (Germany)
  9. Temple Univ., Philadelphia, PA (United States). Dept. of Physics
  10. Univ. of Texas, El Paso, TX (United States). Dept. of Physics
  11. Friedrich-Alexander Univ. Erlangen-Nürnberg (Germany). Dept. of Chemistry and Pharmacy

The fundamental energy gap of a periodic solid distinguishes insulators from metals and characterizes low-energy single-electron excitations. However, the gap in the band structure of the exact multiplicative Kohn–Sham (KS) potential substantially underestimates the fundamental gap, a major limitation of KS density-functional theory. Here, we give a simple proof of a theorem: In generalized KS theory (GKS), the band gap of an extended system equals the fundamental gap for the approximate functional if the GKS potential operator is continuous and the density change is delocalized when an electron or hole is added. Our theorem explains how GKS band gaps from metageneralized gradient approximations (meta-GGAs) and hybrid functionals can be more realistic than those from GGAs or even from the exact KS potential. The theorem also follows from earlier work. The band edges in the GKS one-electron spectrum are also related to measurable energies. Finally, a linear chain of hydrogen molecules, solid aluminum arsenide, and solid argon provide numerical illustrations.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for the Computational Design of Functional Layered Materials (CCDM); Univ. of California, Irvine, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Humboldt Foundation; German Research Foundation (DFG)
Grant/Contract Number:
SC0012575; FG02-08ER46496
OSTI ID:
1388554
Alternate ID(s):
OSTI ID: 1595131
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 11 Vol. 114; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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