Optical response and band structure of LiCoO2 including electron-hole interaction effects
- Case Western Reserve Univ., Cleveland, OH (United States)
- Queen's Univ., Belfast, Northern Ireland (United Kingdom)
- Queen's Univ., Belfast, Northern Ireland (United Kingdom); European Theoretical Spectroscopy Facility (ETSF), Louvain-la-Neuve (Belgium)
- King's College, London (United Kingdom)
- King's College, London (United Kingdom); National Renewable Energy Lab. (NREL), Golden, CO (United States)
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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Related Subjects
GENERAL PHYSICS
Bethe Salpeter Equation
Coulomb interaction
density functional theory (DFT)
electron-hole
excitonic
generalized gradient approximation (GGA)
Green's function
ladder diagrams
LiCoO2
quasiparticle gap
quasiparticle self-consistent QSGW
electronic structure
excitons
density functional calculations
GW method