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Nonlocal energy-optimized kernel: Recovering second-order exchange in the homogeneous electron gas

Journal Article · · Physical Review B
 [1];  [2];  [2]
  1. Temple Univ., Philadelphia, PA (United States); OSTI
  2. Temple Univ., Philadelphia, PA (United States)
In order to remedy some of the shortcomings of the random phase approximation (RPA) within adiabatic connection fluctuation-dissipation (ACFD) density functional theory, we introduce a short-ranged, exchange-like kernel that is one-electron self-correlation free and exact for two-electron systems in the high-density limit. By tuning a free parameter in our model to recover an exact limit of the homogeneous electron gas correlation energy, we obtain a nonlocal, energy-optimized kernel that reduces the errors of RPA for both homogeneous and inhomogeneous solids. Using wave-vector symmetrization for the kernel, we also implement RPA renormalized perturbation theory for extended systems, and demonstrate its capability to describe the dominant correlation effects with a low-order expansion in both metallic and nonmetallic systems. Further, the comparison of ACFD structural properties with experiment is also shown to be limited by the choice of norm-conserving pseudopotential.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Complex Materials from First Principles (CCM); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Temple Univ., Philadelphia, PA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0010499; SC0012575
OSTI ID:
1767452
Alternate ID(s):
OSTI ID: 1235640
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 4 Vol. 93; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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