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Title: Application of the weighted-density approximation to the accurate description of electron-positron correlation effects in materials

Abstract

Here, we discuss positron-annihilation lifetimes for a set of illustrative bulk materials within the framework of the weighted-density approximation (WDA). The WDA can correctly describe electron-positron correlations in strongly inhomogeneous systems, such as surfaces, where the applicability of (semi-)local approximations is limited. We analyze the WDA in detail and show that the electrons which cannot screen external charges efficiently, such as the core electrons, cannot be treated accurately via the pair correlation of the homogeneous electron gas. We discuss how this problem can be addressed by reducing the screening in the homogeneous electron gas by adding terms depending on the gradient of the electron density. Further improvements are obtained when core electrons are treated within the LDA and the valence electron using the WDA. Finally, we discuss a semiempirical WDA-based approach in which a sum rule is imposed to reproduce the experimental lifetimes.

Authors:
 [1];  [1];  [2];  [2];  [1]
  1. Universiteit Antwerpen (Belgium)
  2. Northeastern Univ., Boston, MA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for the Computational Design of Functional Layered Materials (CCDM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1470021
Alternate Identifier(s):
OSTI ID: 1376944
Grant/Contract Number:  
SC0012575; FG02-07ER46352; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 8; Related Information: CCDM partners with Temple University (lead); Brookhaven National Laboratory; Drexel University; Duke University; North Carolina State University; Northeastern University; Princeton University; Rice University; University of Pennsylvania; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; catalysis (heterogeneous); solar (photovoltaic); energy storage (including batteries and capacitors); hydrogen and fuel cells; defects; mechanical behavior; materials and chemistry by design; synthesis (novel materials)

Citation Formats

Callewaert, Vincent, Saniz, Rolando, Barbiellini, Bernardo, Bansil, Arun, and Partoens, Bart. Application of the weighted-density approximation to the accurate description of electron-positron correlation effects in materials. United States: N. p., 2017. Web. doi:10.1103/physrevb.96.085135.
Callewaert, Vincent, Saniz, Rolando, Barbiellini, Bernardo, Bansil, Arun, & Partoens, Bart. Application of the weighted-density approximation to the accurate description of electron-positron correlation effects in materials. United States. https://doi.org/10.1103/physrevb.96.085135
Callewaert, Vincent, Saniz, Rolando, Barbiellini, Bernardo, Bansil, Arun, and Partoens, Bart. Thu . "Application of the weighted-density approximation to the accurate description of electron-positron correlation effects in materials". United States. https://doi.org/10.1103/physrevb.96.085135. https://www.osti.gov/servlets/purl/1470021.
@article{osti_1470021,
title = {Application of the weighted-density approximation to the accurate description of electron-positron correlation effects in materials},
author = {Callewaert, Vincent and Saniz, Rolando and Barbiellini, Bernardo and Bansil, Arun and Partoens, Bart},
abstractNote = {Here, we discuss positron-annihilation lifetimes for a set of illustrative bulk materials within the framework of the weighted-density approximation (WDA). The WDA can correctly describe electron-positron correlations in strongly inhomogeneous systems, such as surfaces, where the applicability of (semi-)local approximations is limited. We analyze the WDA in detail and show that the electrons which cannot screen external charges efficiently, such as the core electrons, cannot be treated accurately via the pair correlation of the homogeneous electron gas. We discuss how this problem can be addressed by reducing the screening in the homogeneous electron gas by adding terms depending on the gradient of the electron density. Further improvements are obtained when core electrons are treated within the LDA and the valence electron using the WDA. Finally, we discuss a semiempirical WDA-based approach in which a sum rule is imposed to reproduce the experimental lifetimes.},
doi = {10.1103/physrevb.96.085135},
journal = {Physical Review B},
number = 8,
volume = 96,
place = {United States},
year = {Thu Aug 24 00:00:00 EDT 2017},
month = {Thu Aug 24 00:00:00 EDT 2017}
}

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Works referencing / citing this record:

Positron induced electron emission from graphite
conference, January 2019

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