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Title: Optical response and band structure of LiCoO2 including electron-hole interaction effects

Journal Article · · Physical Review B

The optical response functions and band structures of LiCoO2 are studied at different levels of approximation, from density functional theory (DFT) in the generalized gradient approximation (GGA) to quasiparticle self-consistent QSGW (with G for Green's function and W for screened Coulomb interaction) without and with ladder diagrams ($$QSG\hat{W}$$) and the Bethe Salpeter Equation (BSE) approach. The QSGW method is found to strongly overestimate the band gap and electron-hole or excitonic effects are found to be important. They lower the quasiparticle gap by only about 11~\% but the lowest energy peaks in absorption are found to be excitonic in nature. The contributions from different band to band transitions and the relation of excitons to band-to-band transitions are analyzed. Finally, the excitons are found to be strongly localized. Finally, a comparison to experimental data is presented.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); US Air Force Office of Scientific Research (AFOSR); Engineering and Physical Research Council (EPSRC)
Grant/Contract Number:
AC36-08GO28308; FA9550-18-1-0030; EP/M011631/1
OSTI ID:
1826296
Report Number(s):
NREL/JA-5F00-80986; MainId:79762; UUID:1c972ac7-3ceb-425a-818c-dfb915560cc4; MainAdminID:63183; TRN: US2215881
Journal Information:
Physical Review B, Vol. 104, Issue 11; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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